Find two standard position primary angles in radians by solving for the unknown. "Primary angles" are those angles which exist between 0 and 2pi. As usual, use exact values in your calculations.

Question

cosx - 2cos^2x = 0

Answer 1

cosx(1 - 2cosx)=0
cosx=0 or cosx=1/2

x = pi/2, 3pi/2, pi/3, 5pi/3 (90,270,60,300º)