If $x = y\sqrt{1 - y^2}$,then $\frac{dy}{dx} = $

  • A
    $0$
  • B
    $x$
  • C
    $\frac{\sqrt{1 - y^2}}{1 - 2y^2}$
  • D
    $\frac{\sqrt{1 - y^2}}{1 + 2y^2}$

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