$\frac{d}{dx} \left\{ \cos^{-1} \left( \frac{1 - x^2}{1 + x^2} \right) \right\} = $
- A$\frac{1}{1 + x^2}$
- B$-\frac{1}{1 + x^2}$
- C$-\frac{2}{1 + x^2}$
- D$\frac{2}{1 + x^2}$
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