1. The problem statement, all variables and given/known data Find the critical numbers of the function: f(θ) = 2cosθ + sin^(2) θ 2. Relevant equations None 3. The attempt at a solution I differentiated the equation and got -2sinθ(1 - cosθ) and found the critical values to be θ = 0 degrees + 2pie * n but the correct answer was npie. Why is this?