1. The problem statement, all variables and given/known data Cosx=0. Solve for all angles where 0<x<2∏, and give the general solutions. 2. Relevant equations 3. The attempt at a solution Angles: x=∏/2, 3∏/2. General solutions (what I think they are): x=∏/2+n2∏ and x=3∏/x+n2∏ where n is an integer. General solutions (what the textbook answer key says they are): x=∏/2+n∏ where n is an integer Aren't general solutions supposed to give angles that are all coterminal with any integer value of n? If I use n=0, I get ∏/2. And if I use n=1, then I get 3∏/2. I understand that those are both quadrantal angles that lie on the y axis, but they aren't coterminal with one another...are they?