$\frac{d}{dx} \tan^{-1} \left( \frac{1-x}{1+x} \right) = $ . . . . . .

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

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