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

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

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