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" 30"cos4x=1-8sin^(2)21*cos^(2)x...

" 30"cos4x=1-8sin^(2)21*cos^(2)x

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cos4x=1-8sin^(2)x cos^(2) x

cos4x=1-8sin^(2)x cos^(2)x

cos4x=1-8sin^(2)x cos^(2)x

Prove that cos4x=1-8sin^(2)xcos^(2)x

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