MCQ
$\tan ^{-1}\left(\frac{x+y}{1-x y}\right)=$
- A$\sin ^{-1}(x+y)$
- B$\cos ^{-1}(x+y)$
- C$\tan ^{-1}(x+y)$
- ✓$\tan ^{-1} x+\tan ^{-1} y$
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