P(r) = [rR(r)]^2,

R(r) = http://i2.photobucket.com/albums/y9/sasuke12_/eq1.jpg, a0 = 0.529 * 10^-10

Find P'(r).

This is an equation from quantum mechanics, I have tried putting log on both sides and pull the powers down, but I'm not sure whether I'm doing the correct thing, please help me. Thanks!!