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Prove that: cos^2 2x- cos^2 6x= sin 4x s...

Prove that: `cos^2 2x- cos^2 6x= sin 4x sin 8x`

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Prove that: cos^2 2x-cos^2 6x= sin4x sin8x

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Prove that: cos^2 2x-cos^2 6x=sin4xsin8x

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Prove the following: cos^2 2x-cos^2 6x=sin4xsin8x

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Prove that sin 5 x cos 2x + cos 6 x sin 3 x = sin 8x cos x