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cos 2x * cos 2x
se cos x 13 então sen 2x + cos 2x vale:
cos x cos 2x cos 3x
cos 2x + cos 4x
cos 2x in terms of cos
what does cos 2x equal
what does cos 2x mean
cos 2x equals what
what is cos 2x equal to
cos x 2 1+cos 2x 2
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