MCQ
$\int \frac{\sin \left(\tan ^{-1} x\right)}{1+x^2} d x=$ __________ , + C .
- A$\cos \left(\tan ^{-1} x\right)$
- B$-\sin \left(\tan ^{-1} x\right)$
- ✓$-\cos \left(\tan ^{-1} x\right)$
- D$\sin \left(\tan ^{-1} x\right)$
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$I.$ The range of $f$ is a closed interval.
$II.$ $f$ is continuous on $R$.
$III.$ $f$ is one-one on $R$