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[" Let "f(x)=cos x*cos2x*cos4x*cos8x],["...

[" Let "f(x)=cos x*cos2x*cos4x*cos8x],[" Then the value of "f'((pi)/(4))" is "],[[" (a) "1," (b) "0],[" (c) "2," (d) "sqrt(2)]]

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