1. The problem statement, all variables and given/known data Classify the local extrema of f(x) = x/2 + cos(x), 0 <= x <= 2pi. Give the exact values of the critical numbers and extrema. Find the absolute (or global) maximum and minimum values of the function. 3. The attempt at a solution So i need to find the critical numbers first right? Take the derivative.. f'(x) = 1/2 - sin(x) set equal to zero.. 0 = 1/2 - sin(x) -> 1/2 = sin(x) how do i find x?