यदि $\left(\frac{dy}{dx}\right) = \frac{1}{\left(\frac{dx}{dy}\right)}$ और $\frac{d^2x}{dy^2}\left(\frac{dy}{dx}\right)^3 + \frac{d^2y}{dx^2} = k$ है, तो $e^{k f(x)} - k f(x) =$

  • A
    $1$
  • B
    $0$
  • C
    $\frac{1}{2}$
  • D
    $2$

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