1. The problem statement, all variables and given/known data Region: f(x) = 2 sin x on the interval [0, π]. Find the volume of the 3D solid obtained by rotating this region about the dashed line y = −1. 2. Relevant equations Integration of pi∫(2sin(x) + 1)^2 dx 3. The attempt at a solution http://www3.wolframalpha.com/Calculate/MSP/MSP85361a550f47a75i0g7800002h3g026g9d9ieg7f?MSPStoreType=image/gif&s=3&w=301&h=35 [Broken] That does not seem to work. I am completely baffled as to what I am doing wrong.