$\sin ^{-1}\left[\sin \left(-600^{\circ}\right)\right]+\cot ^{-1}(-\sqrt{3})=$
$\sin ^{-1}\left[\sin \left(-600^{\circ}\right)\right]+\cot ^{-1}(-\sqrt{3})=$
- $\frac{\pi}{6}$
- $\frac{\pi}{4}$
- $\frac{\pi}{3}$
- $\frac{7 \pi}{6}$
Solution
$\begin{aligned}
& \sin ^{-1}\left[\sin (-600)^{\circ}\right]+\cot ^{-1}(\sqrt{3}) \\
& =\sin ^{-1}\left[-\sin \left(360^{\circ}+180^{\circ}+60^{\circ}\right)\right]+\left[-\cot ^{-1}(\sqrt{3})\right] \\
& =\sin ^{-1}\left[\sin \left(60^{\circ}\right)\right]+\left[-\tan ^{-1}\left(\frac{1}{\sqrt{3}}\right)\right] \\
& =\sin ^{-1}\left[\sin 60^{\circ}\right]-\frac{\pi}{6}=\frac{\pi}{3}-\frac{\pi}{6}=\frac{\pi}{6}
\end{aligned}$
Asked in: MHT CET 2021 (20 Sep Shift 2)
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