यदि $y = 1 + x + x^2 + x^3 + . . . + \infty$ और $|x| < 1$ है,तो $y^{\prime \prime} =$

  • A
    $2 y y^{\prime}$
  • B
    $\frac{2 y}{y^{\prime}}$
  • C
    $\frac{y^{\prime}}{2 y}$
  • D
    $2 y^2 y^{\prime}$

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Difficult
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यदि $y = x + e^x$ है,तो $x = 1$ पर $\frac{d^2x}{dy^2}$ का मान ज्ञात कीजिए।

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