Symbolic Integration for hard expressions and generate function

Hello Chris,

Thank you for your reply. I didn’t know this was possible. Could you please direct me to an example or some code that demonstrates this?

I have another, more important question. After calculating my functions and calling build_function, it seems that because my expression is lengthy, the function generated by build_function cannot be parsed, and I’m encountering errors afterward. Do you have any workaround for this issue? I have also reported this on GitHub.

I should mention it is not for the expression in the codes above, it is a more complex expression.