# Math Help - Integral headache

1. ## Integral headache

Hi. I have problem with this integral. Thanks in advance.

2. ## Re: Integral headache

Hi,
i hope this is true!

if we changed the order of integration assuming neither any of of y, rho,t are functions at phi, in this case we cane reverse the order of integration with respect to phi first. then substituting sin(phi)=x this means that integrating from 0 to 2*pi will give zero with respect to x, so the integral=0.

mopen

3. ## Re: Integral headache

I have tryed that, but it isn't correct... This integral is just a part of one other problem, and result 0 don't match... Thank you for trying!