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

  • A
    $\frac{2x}{x^4+2x^2+2}$
  • B
    $-\frac{2x}{x^4-2x^2+2}$
  • C
    $\frac{2x}{x^4-2x^2+2}$
  • D
    $-\frac{2x}{x^4+2x^2+2}$

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