Hi,

Another integral which Smath cannot solve while Mathcad Prime can:

The Maxima plugin maps the int function to Maxima's integrate, which tries to find a symbolic solution.
For numerical approximations use the quadpack functions (see handbook under Insert> Maxima> Help)

There is also a macro for double integrals, yet I found this to have a cumbersome user interface, therefore I didn't even try it.

quadpack.sm (11,87 KiB) scaricato 1680 volta(e).