1. The problem statement, all variables and given/known data 3. The attempt at a solution I don't understand this equation. 2pi, 4pi, 6pi only = 0 when there is a sine function before it, so I don't see how the evens = 0. I don't see why the e vanishes. I also can't get the i's to vanish since one of them is in exponential form and the other is not. i * 2^i does not get rid of the i in my book. really lost here.