MCQ
$|x| \leq 1,2 \tan ^{-1} x=$
- A$\tan ^{-1} 2 x$
- ✓$\sin ^{-1} \frac{2 x}{1+x^2}$
- C$\cos ^{-1} \frac{2 x}{1+x^2}$
- D$\tan ^{-1} \frac{2 x}{1+x^2}$
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