See https://en.smath.com/forum/yaf_postsm57314_maple-int.aspx#post57314 how to do it.
Maxima:
Enable --> (MaximaTakeover("all")
Restart --> MaximaControl
Solve()
Fit() RMS()
ODE.2(), int(2),
lim() (once side argument is fixed)
Maxima()
Graphics? (remains in insert menu)