Posted by **Manny** on Monday, April 28, 2008 at 6:00pm.

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.

cosx - 2cos^2x = 0

- trig -
**Reiny**, Monday, April 28, 2008 at 7:31pm
cosx(1 - 2cosx)=0

cosx=0 or cosx=1/2

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

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