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

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

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