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

  • A
    $-\frac{1}{1 + x^2}$
  • B
    $\frac{1}{1 + a^2} - \frac{1}{1 + x^2}$
  • C
    $\frac{1}{1 + \left( \frac{a - x}{1 + ax} \right)^2}$
  • D
    $\frac{-1}{\sqrt{1 - \left( \frac{a - x}{1 + ax} \right)^2}}$

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