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10 September, 07:02

Cos^2x-cos^6x=sin4xsin8x

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  1. 10 September, 07:25
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    (cos2x+cos6x) (cos2x-cos6x) =

    (2 sin 4x cos 4x) (2 sin 2x cos 2x) =

    sin 8x sin 4x (Answer)
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