यदि $x \sqrt{1+y}+y \sqrt{1+x}=0$ है,तो $\frac{d y}{d x}$ का मान क्या होगा?

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

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