tried it, works. thanks a lot.

Requires to write, Int(x^2, x)

I would like to add, in the above 'dp' is meant to be read as 'Delta phi'. Maple gave me an error when using the 'Delta' symbol.

@Jakubi: Thanks for your answer. I'm not very experienced with the Maple programming environment. Also, I will consider looking at integration tools, sounds like something interesting.