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13*cos^(2)2x-cos^(2)ax=sin4x sin8x...

13*cos^(2)2x-cos^(2)ax=sin4x sin8x

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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= sin4x sin8x

cos ^(2) 2x -cos ^(2) 6x = sin 4x sin 8x

cos ^(2) 2x -cos ^(2) 6x = sin 4x sin 8x

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cos ^(2) 2x -cos ^(2) 6x = sin 4x sin 8x

cos ^(2) 2x -cos ^(2) 6x = sin 4x sin 8x