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cos 2x + cos x 0
cos x + cos 2x + cos 3x 0
1 + cos x + cos 2x 0
cos 2x − 4 cos x + 3 0
cos x + cos 2x + cos 3x
cos 2 x - cos x
cos 2 x cos x 2
cos 2x in terms of cos x
2 cos x+ cos 3x 0
cos 2x + cos 4x
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