Need help solving.
and cos(2x) = 2cos^2 - 1, 2cos^2 - 1 - cos = -1+cos^2 - 1/4 cos^2 - cos + 1/4 = 0 (cos - 1/2)^2 = 0 cos = 1/2 x = pi/3 or 5pi/3
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