MCQ
यदि $-1< x<1$, तब $2 \tan ^{-1} x=$
- A$\tan ^{-1} 2 x$
- ✓$\tan ^{-1} \frac{2 x}{1-x^2}$
- C$\tan ^{-1} \frac{2 x}{1+x^2}$
- D$\cot ^{-1} \frac{2}{x}$
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