$\frac{d}{dx} \tan^{-1} \left[ \frac{\cos x - \sin x}{\cos x + \sin x} \right] = $

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

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