यदि $e^y(x+1)=1$ है, तो $\frac{d^2y}{dx^2} - \left(\frac{dy}{dx}\right)^2 = $ . . . . . . .

  • A
    $\frac{-1}{x+1}$
  • B
    $e^x$
  • C
    $\frac{1}{x+1}$
  • D
    $0$

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