यदि $\sqrt{x+y}-\sqrt{x-y}=c$ है, तो $\frac{d^2 y}{d x^2}=$

  • A
    $\frac{1}{y}\left(\frac{d y}{d x}\right)^2$
  • B
    $\frac{-c^4}{4 y^3}$
  • C
    $y\left(\frac{d y}{d x}\right)^2$
  • D
    $\frac{-c^2}{4 y^3}$

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