$\sin ^{-1}\left[\sin \left(-600^{\circ}\right)\right]+\cot ^{-1}(-\sqrt{3})=$

$\sin ^{-1}\left[\sin \left(-600^{\circ}\right)\right]+\cot ^{-1}(-\sqrt{3})=$
  1. $\frac{\pi}{6}$
  2. $\frac{\pi}{4}$
  3. $\frac{\pi}{3}$
  4. $\frac{7 \pi}{6}$

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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