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OpenStudy (anonymous):
How would I prove the following trig identity cosx+cos2x+cos3x=cos2x(1+2cosx)
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OpenStudy (anonymous):
cosx+cos2x+cos3x = cos x + cos 3x +cos 2x =2 cos (3x+x)/2 * cos (3x-x)/2 + cos 2x = 2 cos 2x * cos x + cos 2x = cos 2x (2 cos x +1)
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