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cos x cos 2x cos 3x cos 4x...

` cos x cos 2x cos 3x cos 4x `

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cos 4x=cos 2x

If f(x) = cos x cos 2x cos 4x cos 8x cos 16x then find f' (pi/4)

If f(x) = cos x cos 2x cos 4x cos (8x). cos 16x then find f' (pi/4)

If f(x) = cos x cos 2x cos 4x cos (8x). cos 16x then find f' (pi/4)

If f(x) = cos x cos 2x cos 4x cos (8x). cos 16x then find f' (pi/4)

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