MCQ
$\tan ^{-1}(1)+\cos ^{-1}\left(-\frac{1}{2}\right)+\sin ^{-1}\left(-\frac{1}{2}\right)=$
- A$0$
- B$\frac{\pi}{4}$
- ✓$\frac{3 \pi}{4}$
- Dकोई नहीं
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