1. The problem statement, all variables and given/known data See attached image 2. Relevant equations Power reducing Identy: cos^u = (1+Cos2u / 2) 3. The attempt at a solution This is a problem that was done as an example (I know it is not complete it is missing the last integration step) but this is where I am getting stuck my question is where in this (3/2) coming from indicated in red in the image I cannot figure it out??? thanks in advance.