1. The problem statement, all variables and given/known data http://img19.imageshack.us/img19/2559/triple.th.jpg [Broken] 2. Relevant equations 3. The attempt at a solution I get 16pi/3 (sqrt(2) -1) as the final result, but when I input the answer to the computer, it doesn't accept it. Am I doing a wrong integration/calculation anywhere? I double checked and I can't to find anything wrong.