यदि $x+1=e^{-y}$ है,तो $\frac{d^2 y}{d x^2} = $ . . . . . .

  • A
    $\left(\frac{d y}{d x}\right)^3$
  • B
    $\left(\frac{d y}{d x}\right)^2$
  • C
    $\frac{d y}{d x}$
  • D
    $-\frac{d y}{d x}$

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