Answer
(a) $\frac{11\pi}{12}$
Work Step by Step
Within the restricted interval ($0\leq\theta \leq\pi$)
$\cos^{-1}(\cos \theta)=\theta$
Therefore,
$\cos^{-1}(\cos \frac{11\pi}{12})=\frac{11\pi}{12}$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 4 - Section 4.7 - Inverse Trigonometric Functions - 4.7 Problem Set - Page 264: 105
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