If f(x)=cosx.cos2x.cos4x.cos8x.cos16x ,...

If `f(x)=cosx.cos2x.cos4x.cos8x.cos16x` , then `f'(pi/4)` is :

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If f(x)=cos x*cos2x*cos4x*cos8x.cos16x, then f'((pi)/(4)) is :

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f(x)=cos x*cos2x*cos4x*cos8x.cos16x then find f'((pi)/(4))

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

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