MCQ
$\frac{d}{d x}\left[\tan ^{-1}\left(\frac{2 x}{1-x^2}\right)\right]=$
- ✓$\frac{2}{1+x^2}$
- B$\frac{-2}{1+x^2}$
- C$\frac{1}{1+x^2}$
- D$\frac{x}{1+x^2}$
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