If $y = \sqrt {x + \sqrt {x + \sqrt {x + \dots \infty } } }$,then $\frac{dy}{dx} = $

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

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