How can I successfully input the following problem and be able to solve it. I have been trying with no luck. Please advise. Problem: Find the mass of a planet of radius (R), if its density at each radius (p) is δ= (p+1)/p. Notice the infinite density at its center, but finite mass M=∫∫∫δ dV. Here p is radius not density. Ok, I have the answer but have not been able to get with maple. Answer: Mass=∫∫∫psin(Φ)(p+1)dpdΦdΘ= 4/3∏R^3+2∏R^2....