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cos 2 cos 2 cos 2 1
cos 2 cos 2
cos 2a cos 2b cos 2c
cos 2a cos 2b
cos 2x cos 2x
cos 2x cos 2 x - sin 2 x
cos 2x cos 2 x - sen 2 x
cos 2 x cos x 2
cos 2 a + cos 2 b + cos 2 c
f x y cos x cos y e -x 2 - y 2
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