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      <author>Вячеслав Мезенцев</author>
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        <content>
          <p style="font-weight: bold; font-size: 12px; font-family: Consolas;">Double Pendulum</p>
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      <area collapsed="true">
        <title lang="eng">
          <content>
            <p>d</p>
          </content>
        </title>
      </area>
      <region left="18" top="72" width="731" height="260" color="#000000" fontSize="10">
        <math>
          <description active="true" position="Top" lang="eng">
            <content>
              <p>Derivative utility</p>
            </content>
          </description>
          <input>
            <e type="operand">X\032E\</e>
            <e type="operand">t\032E\</e>
            <e type="operand">n\032E\</e>
            <e type="operand">p\032E\</e>
            <e type="function" args="4">DIFF</e>
            <e type="operand">R\0324\</e>
            <e type="operand">0</e>
            <e type="operator" args="2">:</e>
            <e type="operand">R\0324\</e>
            <e type="operand">0</e>
            <e type="operator" args="2">:</e>
            <e type="operand">k\0324\</e>
            <e type="operand">0</e>
            <e type="operator" args="2">:</e>
            <e type="operand">1</e>
            <e type="operand">3</e>
            <e type="function" args="5">mat</e>
            <e type="operand">x\0324\</e>
            <e type="operand">X\032E\</e>
            <e type="operand">str\0324\</e>
            <e type="operand" style="string">diff(</e>
            <e type="operand">x\0324\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,</e>
            <e type="operand">t\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,</e>
            <e type="operand">n\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">)</e>
            <e type="function" args="7">concat</e>
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            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">+</e>
            <e type="operator" args="2">:</e>
            <e type="function" args="2">el</e>
            <e type="operand">str\0324\</e>
            <e type="function" args="1">str2num</e>
            <e type="operand">p\032E\</e>
            <e type="operator" args="2">*</e>
            <e type="operator" args="2">:</e>
            <e type="operand">2</e>
            <e type="operand">1</e>
            <e type="function" args="4">line</e>
            <e type="function" args="3">for</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">≡</e>
            <e type="operand">R\0324\</e>
            <e type="operand">1</e>
            <e type="function" args="2">el</e>
            <e type="operand">k\0324\</e>
            <e type="operand">0</e>
            <e type="operator" args="2">:</e>
            <e type="operand">r\0324\</e>
            <e type="operand">1</e>
            <e type="operand">X\032E\</e>
            <e type="function" args="1">rows</e>
            <e type="function" args="2">range</e>
            <e type="operand">c\0324\</e>
            <e type="operand">1</e>
            <e type="operand">X\032E\</e>
            <e type="function" args="1">cols</e>
            <e type="function" args="2">range</e>
            <e type="operand">A\0324\</e>
            <e type="operand">r\0324\</e>
            <e type="operand">c\0324\</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
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            <e type="function" args="2">el</e>
            <e type="operator" args="2">:</e>
            <e type="function" args="3">for</e>
            <e type="function" args="3">for</e>
            <e type="operand">A\0324\</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
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            <e type="operand">3</e>
            <e type="operand">1</e>
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          <description active="true" position="Top" lang="eng">
            <content>
              <p>d.Aux2 try to catch the differential variable and it's order.</p>
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            <e type="operand">t\032E\</e>
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            <e type="operand">U\0324\</e>
            <e type="operand">t\032E\</e>
            <e type="function" args="1">Unknowns</e>
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            <e type="operand">R\0324\</e>
            <e type="operand">0</e>
            <e type="operator" args="2">:</e>
            <e type="operand">1</e>
            <e type="operand">2</e>
            <e type="function" args="4">mat</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">:</e>
            <e type="operand">k\0324\</e>
            <e type="operand">U\0324\</e>
            <e type="function" args="1">length</e>
            <e type="operator" args="2">≤</e>
            <e type="operand">k\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">+</e>
            <e type="operator" args="2">:</e>
            <e type="operand">str\0324\</e>
            <e type="operand">U\0324\</e>
            <e type="operand">k\0324\</e>
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            <e type="operand">str\0324\</e>
            <e type="operand" style="string">)</e>
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            <e type="operand" style="string">0</e>
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            <e type="operand" style="string">0</e>
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            <e type="function" args="3">for</e>
            <e type="operand">p\0324\</e>
            <e type="operand" style="unit">dSymbol</e>
            <e type="operand">str\0324\</e>
            <e type="function" args="2">concat</e>
            <e type="operand" style="unit">dSymbol</e>
            <e type="operand" style="unit">dSymbol</e>
            <e type="function" args="2">concat</e>
            <e type="operand" style="unit">dSymbol</e>
            <e type="function" args="3">strrep</e>
            <e type="function" args="1">str2num</e>
            <e type="operator" args="2">:</e>
            <e type="operand">n\0324\</e>
            <e type="operand">str\0324\</e>
            <e type="operand" style="unit">dSymbol</e>
            <e type="function" args="2">findstr</e>
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            <e type="bracket">(</e>
            <e type="operand">1</e>
            <e type="operator" args="1">-</e>
            <e type="operator" args="2">≡</e>
            <e type="bracket">(</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
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            <e type="operand">1</e>
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            <e type="function" args="5">mat</e>
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            <e type="operand">1</e>
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            <e type="operand">m\0324\</e>
            <e type="operand">str\0324\</e>
            <e type="operand">1</e>
            <e type="operand">n\0324\</e>
            <e type="function" args="1">rows</e>
            <e type="function" args="3">substr</e>
            <e type="operand" style="unit">dSymbol</e>
            <e type="function" args="2">findstr</e>
            <e type="operator" args="2">:</e>
            <e type="bracket">(</e>
            <e type="operand">1</e>
            <e type="operator" args="1">-</e>
            <e type="operator" args="2">≡</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">2</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">3</e>
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            <e type="operand">1</e>
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            <e type="function" args="5">mat</e>
            <e type="operand">U\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="function" args="2">el</e>
            <e type="operand">l\0324\</e>
            <e type="operand">n\0324\</e>
            <e type="function" args="1">rows</e>
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            <e type="operand">1</e>
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            <e type="operand">p\0324\</e>
            <e type="operand">1</e>
            <e type="operand">3</e>
            <e type="function" args="5">mat</e>
            <e type="operator" args="2">:</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">2</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">3</e>
            <e type="function" args="3">el</e>
            <e type="operand">1</e>
            <e type="operand">3</e>
            <e type="function" args="5">mat</e>
            <e type="operand">U\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="function" args="2">el</e>
            <e type="operand">l\0324\</e>
            <e type="operand">m\0324\</e>
            <e type="function" args="1">rows</e>
            <e type="operator" args="2">+</e>
            <e type="operand">1</e>
            <e type="operator" args="2">-</e>
            <e type="operand">p\0324\</e>
            <e type="operand">1</e>
            <e type="operand">3</e>
            <e type="function" args="5">mat</e>
            <e type="operator" args="2">:</e>
            <e type="function" args="3">if</e>
            <e type="function" args="3">if</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
            <e type="function" args="3">if</e>
            <e type="operand">2</e>
            <e type="operand">1</e>
            <e type="function" args="4">line</e>
            <e type="function" args="4">for</e>
            <e type="operand">R\0324\</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
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          <description active="true" position="Top" lang="eng" width="103">
            <content>
              <p>∂(x,t) returns x'*∂t</p>
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          </description>
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            <e type="operand">x\032E\</e>
            <e type="operand">t\032E\</e>
            <e type="function" args="2">∂</e>
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            <e type="operand">t\032E\</e>
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            <e type="operand">D\0324\</e>
            <e type="operand">x\032E\</e>
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            <e type="operand">R\0324\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">0</e>
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            <e type="operand">D\0324\</e>
            <e type="operand">0</e>
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            <e type="operand">R\0324\</e>
            <e type="function" args="1">rows</e>
            <e type="function" args="2">range</e>
            <e type="operand">D\0324\</e>
            <e type="operand">D\0324\</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">2</e>
            <e type="function" args="3">el</e>
            <e type="operand">R\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">3</e>
            <e type="function" args="3">el</e>
            <e type="bracket">(</e>
            <e type="operand">R\0324\</e>
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            <e type="operand">2</e>
            <e type="function" args="3">el</e>
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            <e type="function" args="4">DIFF</e>
            <e type="operator" args="2">:</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="function" args="3">for</e>
            <e type="function" args="3">if</e>
            <e type="operand">D\0324\</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1071" width="322" height="94" color="#000000" fontSize="10">
        <math>
          <description active="true" position="Top" lang="eng" width="208">
            <content>
              <p>d(x) returns the total differential of x</p>
            </content>
          </description>
          <input>
            <e type="operand">x\032E\</e>
            <e type="function" args="1">d</e>
            <e type="operand">U\0324\</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="1">Unknowns</e>
            <e type="operator" args="2">:</e>
            <e type="operand">s\0324\</e>
            <e type="operand">0</e>
            <e type="operator" args="2">:</e>
            <e type="operand">1</e>
            <e type="operand">2</e>
            <e type="function" args="4">mat</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">:</e>
            <e type="operand">k\0324\</e>
            <e type="operand">U\0324\</e>
            <e type="function" args="1">length</e>
            <e type="operator" args="2">≤</e>
            <e type="operand">k\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">+</e>
            <e type="operator" args="2">:</e>
            <e type="operand">s\0324\</e>
            <e type="operand">s\0324\</e>
            <e type="operand">x\032E\</e>
            <e type="operand">U\0324\</e>
            <e type="operand">k\0324\</e>
            <e type="function" args="2">el</e>
            <e type="function" args="2">∂</e>
            <e type="operator" args="2">+</e>
            <e type="operator" args="2">:</e>
            <e type="function" args="4">for</e>
            <e type="operand">s\0324\</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
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        <area terminator="true" />
      </region>
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      <area collapsed="true">
        <title lang="eng">
          <content>
            <p>equrep</p>
          </content>
        </title>
      </area>
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        <math>
          <input>
            <e type="operand">\032E\a</e>
            <e type="function" args="1">TrueQ</e>
            <e type="operand">\032E\a</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">1</e>
            <e type="operator" args="2">≡</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="297" top="1251" width="231" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">\032E\a</e>
            <e type="function" args="1">FalseQ</e>
            <e type="operand">\032E\a</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">0</e>
            <e type="operator" args="2">≡</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1287" width="311" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">\032E\a</e>
            <e type="operand">b\032E\</e>
            <e type="function" args="2">EqualQ</e>
            <e type="operand">\032E\a</e>
            <e type="function" args="1">num2str</e>
            <e type="operand">b\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operator" args="2">≡</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1323" width="749" height="30" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="operand">\032E\a</e>
            <e type="operand">b\032E\</e>
            <e type="function" args="3">EquRep</e>
            <e type="operand" style="string">equrep(</e>
            <e type="operand">E\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,</e>
            <e type="operand">\032E\a</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,</e>
            <e type="operand">b\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">)</e>
            <e type="function" args="7">concat</e>
            <e type="function" args="1">str2num</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1359" width="1126" height="30" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="operand">\032E\a</e>
            <e type="operand">b\032E\</e>
            <e type="operand">q\032E\</e>
            <e type="function" args="4">EquRep</e>
            <e type="operand" style="string">equrep(</e>
            <e type="operand">E\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,</e>
            <e type="operand">\032E\a</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,if(TrueQ(</e>
            <e type="operand">q\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">),</e>
            <e type="operand">b\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,</e>
            <e type="operand">a#</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">))</e>
            <e type="function" args="11">concat</e>
            <e type="function" args="1">str2num</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1404" width="536" height="28" color="#000000" fontSize="10">
        <math evaluate="false">
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(a/b,z)</e>
            <e type="operand" style="string">EQ.B(a,b,z,a/b,z/a,z*b)</e>
            <e type="operand">1</e>
            <e type="operand" style="string">quotient</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="function" args="2">stack</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="180" top="1431" width="28" height="24" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">a#</e>
          </input>
        </math>
      </region>
      <region left="297" top="1431" width="28" height="24" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">b#</e>
          </input>
        </math>
      </region>
      <region left="432" top="1431" width="28" height="24" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">q#</e>
          </input>
        </math>
      </region>
      <region left="18" top="1467" width="470" height="93" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="operand">Rules\032E\</e>
            <e type="function" args="2">EquRep</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">E\032E\</e>
            <e type="operator" args="2">:</e>
            <e type="operand">n\0324\</e>
            <e type="operand">1</e>
            <e type="operand">Rules\032E\</e>
            <e type="function" args="1">rows</e>
            <e type="function" args="2">range</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">Rules\032E\</e>
            <e type="operand">n\0324\</e>
            <e type="operand">1</e>
            <e type="function" args="3">el</e>
            <e type="operand">Rules\032E\</e>
            <e type="operand">n\0324\</e>
            <e type="operand">2</e>
            <e type="function" args="3">el</e>
            <e type="function" args="3">EquRep</e>
            <e type="operator" args="2">:</e>
            <e type="function" args="3">for</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1575" width="510" height="136" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="operand">Rules\032E\</e>
            <e type="function" args="2">EquRepN</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">E\032E\</e>
            <e type="operator" args="2">:</e>
            <e type="operand">N\0324\</e>
            <e type="operand">1</e>
            <e type="operand" style="unit">EquRepN</e>
            <e type="function" args="2">range</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">Rules\032E\</e>
            <e type="function" args="2">EquRep</e>
            <e type="operator" args="2">:</e>
            <e type="function" args="2">EqualQ</e>
            <e type="operand">break</e>
            <e type="operand">continue</e>
            <e type="function" args="3">if</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="function" args="3">for</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1719" width="705" height="144" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="function" args="1">equal2EQ</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">E\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operator" args="2">:</e>
            <e type="operand">ans\0324\</e>
            <e type="operand" style="string">≡</e>
            <e type="function" args="2">findstr</e>
            <e type="operand">1</e>
            <e type="operator" args="1">-</e>
            <e type="operator" args="2">≡</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">ans\0324\</e>
            <e type="operand" style="string">≡0</e>
            <e type="function" args="2">concat</e>
            <e type="operator" args="2">:</e>
            <e type="operand">n\0324\</e>
            <e type="operand">ans\0324\</e>
            <e type="operand" style="string">≡</e>
            <e type="function" args="2">findstr</e>
            <e type="operand">1</e>
            <e type="function" args="2">el</e>
            <e type="operator" args="2">:</e>
            <e type="operand">1</e>
            <e type="operand">2</e>
            <e type="function" args="4">mat</e>
            <e type="operand">n\0324\</e>
            <e type="operand">ans\0324\</e>
            <e type="operand" style="string">≡</e>
            <e type="function" args="2">findstr</e>
            <e type="operand">1</e>
            <e type="function" args="2">el</e>
            <e type="operator" args="2">:</e>
            <e type="function" args="3">if</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">1</e>
            <e type="operand">n\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">-</e>
            <e type="function" args="3">substr</e>
            <e type="function" args="1">str2num</e>
            <e type="operand">ans\0324\</e>
            <e type="operand">n\0324\</e>
            <e type="operand">1</e>
            <e type="operator" args="2">+</e>
            <e type="operand">ans\0324\</e>
            <e type="function" args="1">strlen</e>
            <e type="operand">n\0324\</e>
            <e type="operator" args="2">-</e>
            <e type="function" args="3">substr</e>
            <e type="function" args="1">str2num</e>
            <e type="operand">1</e>
            <e type="operand">2</e>
            <e type="function" args="4">mat</e>
            <e type="operand">3</e>
            <e type="operand">1</e>
            <e type="function" args="5">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1872" width="721" height="35" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="2">depends</e>
            <e type="operand">E\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="1">_DEPENDS.X#</e>
            <e type="function" args="3">EquRep</e>
            <e type="function" args="1">num2str</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="1">_DEPENDS.X#</e>
            <e type="function" args="1">num2str</e>
            <e type="function" args="2">findstr</e>
            <e type="operand">1</e>
            <e type="operator" args="1">-</e>
            <e type="operator" args="2">≠</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1908" width="387" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">\032E\a</e>
            <e type="operand">b\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="3">depends</e>
            <e type="operand">\032E\a</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="2">depends</e>
            <e type="operand">b\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="2">depends</e>
            <e type="operator" args="2">&amp;</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1944" width="791" height="32" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="2">DIFF</e>
            <e type="operand" style="string">diff(</e>
            <e type="operand">E\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="operand">_DIFF#</e>
            <e type="function" args="3">EquRep</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,_DIFF#)</e>
            <e type="function" args="3">concat</e>
            <e type="function" args="1">str2num</e>
            <e type="operand">_DIFF#</e>
            <e type="operand">x\032E\</e>
            <e type="function" args="3">EquRep</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="1980" width="951" height="32" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand">E\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="operand">n\032E\</e>
            <e type="function" args="3">DIFF</e>
            <e type="operand" style="string">diff(</e>
            <e type="operand">E\032E\</e>
            <e type="operand">x\032E\</e>
            <e type="operand">_DIFF#</e>
            <e type="function" args="3">EquRep</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">,_DIFF#,</e>
            <e type="operand">n\032E\</e>
            <e type="function" args="1">num2str</e>
            <e type="operand" style="string">)</e>
            <e type="function" args="5">concat</e>
            <e type="function" args="1">str2num</e>
            <e type="operand">_DIFF#</e>
            <e type="operand">x#</e>
            <e type="function" args="3">EquRep</e>
            <e type="operand">1</e>
            <e type="operand">1</e>
            <e type="function" args="3">line</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="2025" width="100" height="24" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EquRepN</e>
            <e type="operand">20</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region top="2061" color="#000000">
        <area terminator="true" />
      </region>
    </region>
    <region top="2079" color="#000000">
      <area collapsed="true">
        <title lang="eng">
          <content>
            <p>isol</p>
          </content>
        </title>
      </area>
      <region left="18" top="2115" width="325" height="27" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(-a,b)</e>
            <e type="operand" style="string">EQ(a,0-b)</e>
            <e type="operand" style="string">1</e>
            <e type="operand" style="string">minus</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="2142" width="672" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(a^b,z)</e>
            <e type="operand" style="string">EQ.B(a,b,z,a^b,ln(z)/ln(a),'sign*z^(1/b))</e>
            <e type="operand" style="string">1</e>
            <e type="operand" style="string">power</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="function" args="2">stack</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="783" top="2142" width="346" height="24" color="#000000" fontSize="10">
        <math>
          <description active="true" position="Top" lang="eng">
            <content>
              <p>Not usual but better</p>
            </content>
          </description>
          <input>
            <e type="operand" style="string">EQ.B(a,b,z,a^b,ln(z)/ln(a),exp(ln(z)/b))</e>
          </input>
        </math>
      </region>
      <region left="18" top="2169" width="552" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(a/b,z)</e>
            <e type="operand" style="string">EQ.B(a,b,z,a/b,z/a,z*b)</e>
            <e type="operand" style="string">1</e>
            <e type="operand" style="string">quotient</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="function" args="2">stack</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="2196" width="528" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(a*b,z)</e>
            <e type="operand" style="string">EQ.B(a,b,z,a*b,z/a,z/b)</e>
            <e type="operand" style="string">1</e>
            <e type="operand" style="string">times</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="function" args="2">stack</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="2223" width="520" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(a+b,z)</e>
            <e type="operand" style="string">EQ.B(a,b,z,a+b,z-a,z-b)</e>
            <e type="operand" style="string">1</e>
            <e type="operand" style="string">plus</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="function" args="2">stack</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="2250" width="408" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(a,z)</e>
            <e type="operand" style="string">EQ.L(a,z)</e>
            <e type="operand" style="string">1</e>
            <e type="operand" style="string">lineal</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="function" args="2">stack</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="2277" width="504" height="28" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="unit">EQ</e>
            <e type="operand" style="string">EQ(x*(b+a*x),z)</e>
            <e type="operand" style="string">EQ.P2(a,b,x,z)</e>
            <e type="operand" style="string">1</e>
            <e type="operand" style="string">Poly2</e>
            <e type="operand">1</e>
            <e type="operand">4</e>
            <e type="function" args="6">mat</e>
            <e type="function" args="2">stack</e>
            <e type="operator" args="2">:</e>
          </input>
        </math>
      </region>
      <region left="18" top="2313" width="963" height="54" color="#000000" fontSize="10">
        <math>
          <input>
            <e type="operand" style="unit">EQA</e>
            <e type="operand" style="string">sin</e>
            <e type="operand" style="string">cos</e>
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</raw>
      </picture>
    </region>
    <region left="18" top="3447" width="124" height="24" color="#008080" fontSize="10" isBreakable="false">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
            <p style="font-weight: bold; font-family: Consolas; color: #008080;">Double Pendulum</p>
          </content>
      </text>
    </region>
    <region left="198" top="3447" width="80" height="24" color="#000000" fontSize="10" isBreakable="false">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
            <p style="font-family: Consolas;">Constants</p>
          </content>
      </text>
    </region>
    <region left="288" top="3447" width="60" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂m.1</e>
          <e type="operand">0</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="351" top="3447" width="60" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂m.2</e>
          <e type="operand">0</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="423" top="3447" width="54" height="24" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂g</e>
          <e type="operand">0</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="288" top="3474" width="60" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂L.1</e>
          <e type="operand">0</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="351" top="3474" width="60" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂L.2</e>
          <e type="operand">0</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="198" top="3519" width="87" height="24" color="#000000" fontSize="10" isBreakable="false">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
            <p style="font-family: Consolas;">Gen Coords</p>
          </content>
      </text>
    </region>
    <region left="288" top="3519" width="103" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂θ.1</e>
          <e type="operand">θ'.1</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="396" top="3519" width="119" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂θ'.1</e>
          <e type="operand">θ''.1</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="288" top="3546" width="103" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂θ.2</e>
          <e type="operand">θ'.2</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="396" top="3546" width="119" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">∂θ'.2</e>
          <e type="operand">θ''.2</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="18" top="3591" width="73" height="24" color="#000000" fontSize="10" isBreakable="false">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
            <p style="font-family: Consolas;">Position</p>
          </content>
      </text>
    </region>
    <region left="198" top="3591" width="125" height="30" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x.1</e>
          <e type="operand">L.1</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="396" top="3591" width="138" height="30" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">y.1</e>
          <e type="operand">L.1</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="1">-</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="198" top="3627" width="158" height="30" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x.2</e>
          <e type="operand">x.1</e>
          <e type="operand">L.2</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="396" top="3627" width="156" height="30" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">y.2</e>
          <e type="operand">y.1</e>
          <e type="operand">L.2</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="198" top="3672" width="98" height="47" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x'.1</e>
          <e type="operand">x.1</e>
          <e type="function" args="1">d</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="324" top="3672" width="98" height="47" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">y'.1</e>
          <e type="operand">y.1</e>
          <e type="function" args="1">d</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="441" top="3672" width="98" height="47" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x'.2</e>
          <e type="operand">x.2</e>
          <e type="function" args="1">d</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="567" top="3672" width="98" height="47" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">y'.2</e>
          <e type="operand">y.2</e>
          <e type="function" args="1">d</e>
          <e type="operand">∂t</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="18" top="3735" width="87" height="24" color="#000000" fontSize="10" isBreakable="false">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
            <p style="font-family: Consolas;">Lagrangian</p>
          </content>
      </text>
    </region>
    <region left="198" top="3735" width="490" height="42" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">L</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="operator" args="2">/</e>
          <e type="operand">m.1</e>
          <e type="operator" args="2">*</e>
          <e type="operand">x'.1</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operand">y'.1</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="operator" args="2">/</e>
          <e type="operand">m.2</e>
          <e type="operator" args="2">*</e>
          <e type="operand">x'.2</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operand">y'.2</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">m.1</e>
          <e type="operand">g</e>
          <e type="operator" args="2">*</e>
          <e type="operand">y.1</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">-</e>
          <e type="operand">m.2</e>
          <e type="operand">g</e>
          <e type="operator" args="2">*</e>
          <e type="operand">y.2</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="18" top="3789" width="153" height="24" color="#000000" fontSize="10" isBreakable="false">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
            <p style="font-family: Consolas;">Equations of motion</p>
          </content>
      </text>
    </region>
    <region left="198" top="3789" width="482" height="64" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">eq.1</e>
          <e type="operand">1</e>
          <e type="operand">\2202\t</e>
          <e type="operator" args="2">/</e>
          <e type="operand">L</e>
          <e type="operand">θ'.1</e>
          <e type="function" args="2">∂</e>
          <e type="operand">∂θ'.1</e>
          <e type="operator" args="2">/</e>
          <e type="function" args="1">d</e>
          <e type="operator" args="2">*</e>
          <e type="operand">L</e>
          <e type="operand">θ.1</e>
          <e type="function" args="2">∂</e>
          <e type="operand">∂θ.1</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">-</e>
          <e type="operand">θ''.1</e>
          <e type="function" args="2">isol</e>
          <e type="operand">θ''.1</e>
          <e type="operator" args="2">-</e>
          <e type="function" args="1">numden</e>
          <e type="operand">1</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="198" top="3861" width="482" height="64" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">eq.2</e>
          <e type="operand">1</e>
          <e type="operand">\2202\t</e>
          <e type="operator" args="2">/</e>
          <e type="operand">L</e>
          <e type="operand">θ'.2</e>
          <e type="function" args="2">∂</e>
          <e type="operand">∂θ'.2</e>
          <e type="operator" args="2">/</e>
          <e type="function" args="1">d</e>
          <e type="operator" args="2">*</e>
          <e type="operand">L</e>
          <e type="operand">θ.2</e>
          <e type="function" args="2">∂</e>
          <e type="operand">∂θ.2</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">-</e>
          <e type="operand">θ''.2</e>
          <e type="function" args="2">isol</e>
          <e type="operand">θ''.2</e>
          <e type="operator" args="2">-</e>
          <e type="function" args="1">numden</e>
          <e type="operand">1</e>
          <e type="function" args="2">el</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="18" top="3933" width="1152" height="46" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">eq.1</e>
        </input>
        <result action="symbolic">
          <e type="operand">m.2</e>
          <e type="operand">L.2</e>
          <e type="operand">θ'.2</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">sin</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="1">-</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">cos</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">cos</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">*</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">sin</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operand">θ''.2</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operand">g</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operand">m.1</e>
          <e type="operand">g</e>
          <e type="operator" args="2">*</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">θ''.1</e>
          <e type="operand">L.1</e>
          <e type="operator" args="2">*</e>
          <e type="operand">m.1</e>
          <e type="operand">m.2</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="1">-</e>
        </result>
      </math>
    </region>
    <region left="18" top="3987" width="929" height="44" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">eq.2</e>
        </input>
        <result action="symbolic">
          <e type="operand">L.1</e>
          <e type="operand">θ'.1</e>
          <e type="operand">2</e>
          <e type="operator" args="2">^</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">sin</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="1">-</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">cos</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">cos</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">cos</e>
          <e type="operator" args="2">*</e>
          <e type="operand">θ.1</e>
          <e type="function" args="1">sin</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operand">θ''.1</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="2">*</e>
          <e type="operand">g</e>
          <e type="operand">θ.2</e>
          <e type="function" args="1">sin</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="operand">θ''.2</e>
          <e type="operand">L.2</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">+</e>
          <e type="bracket">(</e>
          <e type="operator" args="1">-</e>
        </result>
      </math>
    </region>
    <region left="18" top="4041" width="249" height="24" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>(without further simplification)</p>
        </content>
      </text>
    </region>
    <region left="18" top="4077" width="58" height="24" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Values</p>
        </content>
      </text>
    </region>
    <region left="126" top="4077" width="52" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">m.1</e>
          <e type="operand">1</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="207" top="4077" width="52" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">L.1</e>
          <e type="operand">1</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="288" top="4077" width="57" height="41" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">θ.1..b</e>
          <e type="operand">π</e>
          <e type="operand">2</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="378" top="4077" width="70" height="24" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">g</e>
          <e type="operand">9.82</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="477" top="4077" width="65" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">t.end</e>
          <e type="operand">8</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="288" top="4113" width="57" height="41" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">θ.2..b</e>
          <e type="operand">π</e>
          <e type="operand">2</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="126" top="4122" width="68" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">m.2</e>
          <e type="operand">0.5</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="207" top="4122" width="68" height="29" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">L.2</e>
          <e type="operand">0.2</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="18" top="4167" width="153" height="24" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p>Lagrangian solution</p>
        </content>
      </text>
    </region>
    <region left="18" top="4203" width="380" height="145" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">t</e>
          <e type="operand">u</e>
          <e type="operand">θ''</e>
          <e type="function" args="3">D</e>
          <e type="operand">θ.1</e>
          <e type="operand">θ'.1</e>
          <e type="operand">θ.2</e>
          <e type="operand">θ'.2</e>
          <e type="operand">1</e>
          <e type="operand">4</e>
          <e type="function" args="6">mat</e>
          <e type="operand">u</e>
          <e type="operand">1</e>
          <e type="function" args="2">el</e>
          <e type="operand">u</e>
          <e type="operand">2</e>
          <e type="function" args="2">el</e>
          <e type="operand">u</e>
          <e type="operand">3</e>
          <e type="function" args="2">el</e>
          <e type="operand">u</e>
          <e type="operand">4</e>
          <e type="function" args="2">el</e>
          <e type="operand">1</e>
          <e type="operand">4</e>
          <e type="function" args="6">mat</e>
          <e type="operator" args="2">:</e>
          <e type="operand">θ''.1</e>
          <e type="operand">θ''.2</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operand">v</e>
          <e type="operand">1</e>
          <e type="function" args="2">el</e>
          <e type="operand">v</e>
          <e type="operand">2</e>
          <e type="function" args="2">el</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" args="4">mat</e>
          <e type="operator" args="2">:</e>
          <e type="operand">v</e>
          <e type="function" args="1">eq.3</e>
          <e type="operand">eq.1</e>
          <e type="operand">eq.2</e>
          <e type="function" args="2">stack</e>
          <e type="operator" args="2">:</e>
          <e type="operand">θ''</e>
          <e type="operand">θ''</e>
          <e type="operand">eq.3</e>
          <e type="function" args="2">al_nleqsolve</e>
          <e type="operator" args="2">:</e>
          <e type="operand">θ'.1</e>
          <e type="operand">θ''</e>
          <e type="operand">1</e>
          <e type="function" args="2">el</e>
          <e type="operand">θ'.2</e>
          <e type="operand">θ''</e>
          <e type="operand">2</e>
          <e type="function" args="2">el</e>
          <e type="function" args="4">stack</e>
          <e type="operand">5</e>
          <e type="operand">1</e>
          <e type="function" args="7">line</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="423" top="4203" width="77" height="45" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">θ''</e>
          <e type="operand">0</e>
          <e type="operand">0</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="522" top="4203" width="212" height="40" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p style="font-family: Consolas;">This way is for update the guess for θ''</p>
        </content>
      </text>
    </region>
    <region left="522" top="4257" width="205" height="88" color="#000000" fontSize="10">
      <text lang="eng" fontFamily="Consolas" fontSize="10">
        <content>
          <p style="font-family: Consolas;">Although in this case the second derivatives can be isolated, it is much more practical to solve them numerically.</p>
        </content>
      </text>
    </region>
    <region left="18" top="4365" width="371" height="37" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">U</e>
          <e type="operand">θ.1..b</e>
          <e type="operand">0</e>
          <e type="operand">θ.2..b</e>
          <e type="operand">0</e>
          <e type="function" args="4">stack</e>
          <e type="operand">0</e>
          <e type="operand">t.end</e>
          <e type="operand">500</e>
          <e type="operand">D</e>
          <e type="function" args="5">rkfixed</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="18" top="4401" width="334" height="32" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">T</e>
          <e type="operand">θ.1</e>
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          <p>Comparing both solutions: aren't the same</p>
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