Answer
$-\frac{\pi}{6}.$
Work Step by Step
Since $\sin \left(-\frac{5\pi}{6}\right)=-\frac{1}{2}$, we have
$$\sin^{-1}\left(\sin\left(-\frac{5\pi}{6}\right)\right)=\sin^{-1}\left(-\frac{1}{2}\right)=-\frac{\pi}{6}.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 7 - Exponential Functions - 7.8 Inverse Trigonometric Functions - Exercises - Page 374: 10
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