1. The problem statement, all variables and given/known data 3. The attempt at a solution It looks like they think the integration of (cos(p)/(sqrt(1-sin^2p)))dp = 1. I don't see how. I looked at my table of common integrals and I didn't see it. I know that cos^2 + sin^2 = 1 of course but I don't how that helps with the above.