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Find the derivative of the functions giv...

Find the derivative of the functions given by `f(x)= (1+x)(1+x^(2))(1+x^(4))(1+x^(8))` and hence find f'(1).

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The correct Answer is:
`(1+x)(1+x^2)(1+x^4)(1+x^8)[(1)/(1+x)+(2x)/(1+x^2)+(4x^3)/(1+x^4)+(8x^7)/(1+x^8)]; f'(1)=120`
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