यदि $f(x)=(1+x)(1+x^2)(1+x^4)(1+x^8)$ है,तो $f^{\prime}(1)=$

  • A
    $60$
  • B
    $80$
  • C
    $240$
  • D
    $120$

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यदि $y=(1+x)(1+x^2)(1+x^4) \dots (1+x^{2n})$ है,तो $x=0$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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यदि $\frac{d}{d x}\left(\frac{x \cdot 2^x-x}{1-\cos x}\right)=\left(\frac{x \cdot 2^x-x}{1-\cos x}\right)(f(x)+\log 2)$ है, तो $f(x)=$

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