यदि $x \sqrt{1+y}+y \sqrt{1+x}=0$ है, तो $\frac{d y}{d x}=$

  • A
    $\frac{-1}{(1+x)^2}$
  • B
    $\frac{1}{(1+x)^2}$
  • C
    $\frac{2}{(1+x)^{3 / 2}}$
  • D
    $\frac{-2}{(1+x)^{1 / 2}}$

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