Answer
$\cos^{-1}a$
Work Step by Step
If $0\leq\theta\leq\pi$ and $\cos\theta=a$, then $\cos^{-1}a=\theta$.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - Chapter Review - Page 898: 4
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