1. The problem statement, all variables and given/known data The whole integral is a double integral, but I can't even perform the first integration. The integrand is cosx*sqrt(3+(cosx)^2) dxdy The x bounds are from arctan(y) to pi/4 the y bounds are from 0 to 1 2. Relevant equations Converting rectangular to polar may help. 3. The attempt at a solution I've tried parts, but it was a disaster. I also started converting it to polar, but that was also a disaster.