यदि $y = e^{nx}$ है,तो $\left( \frac{d^2y}{dx^2} \right) \left( \frac{d^2x}{dy^2} \right)$ का मान ज्ञात कीजिए।

  • A
    $ne^{nx}$
  • B
    $ne^{-nx}$
  • C
    $1$
  • D
    $-ne^{-nx}$

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