Answer
$45^{\circ}$
Work Step by Step
Within the restricted interval ($0^{\circ}\leq\theta\leq180^{\circ}$),
$\cos^{-1}(\cos\theta)=\theta$
Therefore, $\cos^{-1}(\cos 45^{\circ})=45^{\circ}$
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 262: 66
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