1. The problem statement, all variables and given/known data I'm actually in the middle of a multivariable question, and I am stuck because I don't remember how to integrate [tex]sin(\phi)cos(\phi)[/tex] . 3. The attempt at a solution I have an understanding of the material, but I can't remember how to integrate this. Someone please refresh my memory :) . I would appreciate some kind of step by step integration, so if this was on the test I would understand how to do it.