If $y=\sqrt{x+\sqrt{y+\sqrt{x+\sqrt{y+\ldots \infty}}}}$, then $\frac{d y}{d x}=$

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

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