यदि $y=\frac{\log _e x}{x}$ और $z=\log _e x$ है, तो $\frac{d^2 y}{d z^2}+\frac{d y}{d z}$ का मान ज्ञात कीजिए।

  • A
    $e^{-z}$
  • B
    $2 e^{-z}$
  • C
    $z e^{-z}$
  • D
    $-e^{-z}$

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