1. The problem statement, all variables and given/known data ∫r^3/(4+r^2)^(1/2) dr 2. Relevant equations ∫udv=uv-∫vdu 3. The attempt at a solution I know that integration by parts must be used. I tried doing it with 4+r^2 as u, but kept running into issues..then I got an answer but it appears to be wrong. I guess I am not sure how to do this.