1. The problem statement, all variables and given/known data I'm working out different pathlengths for different solids but I'm stuck on the following integral: 2. Relevant equations [tex]\int[/tex] x*exp(-C*sqrt[1-x2/A2]) dx exp = exponential func sqrt = square root C and A are constants 3. The attempt at a solution I tried to work it out with the substitution method, where u = -C*sqrt[1-x2/A2] and du = C/A2x(1-x2/A2)-1/2. But it seems to be getting really complex afterwards, so I was wondering if I'm overlooking the simple approach for this integral?