Posted by Wendy on Friday, September 16, 2011 at 4:44pm.
2(1-cos^2 x) = 2 + cos x
2 - 2 cos^2 x = 2 + cos x
2 cos^2 x + cos x = 0
cos x (2 cos x + 1 ) = 0
cos x = 0 when x = pi/2 or 90 degrees or 3 pi/2 or 270 deg
or
cos x = -1/2 at x = 2pi/3 or 120 degrees or at 4 pi/3 or 240 degrees
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