$\frac{d}{dx} \left[ \tan^{-1} \left( \frac{\sqrt{1 + x^2} + \sqrt{1 - x^2}}{\sqrt{1 + x^2} - \sqrt{1 - x^2}} \right) \right] = $

  • A
    $\frac{-x}{\sqrt{1 - x^4}}$
  • B
    $\frac{x}{\sqrt{1 - x^4}}$
  • C
    $\frac{-1}{2\sqrt{1 - x^4}}$
  • D
    $\frac{1}{2\sqrt{1 - x^4}}$

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