I need to take the integral of an equation. I am trying to do Integration by Parts but I am coming up short. I need to integrate (x^2 + y^2 + z^2)^(-3/2) dy for a Astronomy problem. I tried: u = x^2 + y^2 + z^2 du = 2*y dy v=u^(-3/2) dv = -3/2*u^(-5/2) I can not do anything with the "y" in du. Can you help?