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Homework Statement
Find the critical numbers of the function:
f(θ) = 2cosθ + sin^(2) θ
Homework Equations
None
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?