MCQ
The principal solution of $\tan ^{-1}\left(\tan \left(\frac{7 \pi}{6}\right)\right)$ is
- A$\frac{7 \pi}{6}$
- ✓$\frac{\pi}{6}$
- C$\frac{-\pi}{6}$
- D$\frac{-5 \pi}{6}$
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