Posted by Lindsey on Tuesday, January 17, 2012 at 7:40pm.
(1-cos^2 x) + cos x + 1 = 0
- cos^2 x + cos x + 2 = 0
cos^2 x - cos x - 2 = 0
(cos x - 2)(cos x + 1) = 0
cos x = 2 impossible, out of range
so
cos x = -1
pi
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