1. The problem statement, all variables and given/known data 2sin2θ - 1 = sin2θ - cos2θ 2. Relevant equations 3. The attempt at a solution I am unsure of how to prove these. So far all I have is Left side= 2sin2θ - 1 =sin2sin2-1 And I know that right side is equal to 1. But otherwise not sure where to go from there.