MCQ
$\tan ^{-1}(1)+\tan ^{-1}(2)+\tan ^{-1}(3)=\ldots \ldots \ldots \ldots \ldots$
- A$\frac{\pi}{4}$
- B$-\frac{\pi}{4}$
- C$\frac{\pi}{2}$
- ✓$\pi$
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