I started by letting
I believe I need to use polar coordinates, but I not sure how. Any help would be greatly appreciated.
The correct answer is . So, I am still stuck on this problem. I am not sure what I am doing wrong. I would have the correct answer if I integrated from 0 to with respect to , but I don't thank that would be proper.
Note: The polar coordinates make things a little confusing, because the in the integrand is a constant and not related to .