Answer
$x = 2~arccos(\frac{y}{3})$
Work Step by Step
$y = 3~cos~\frac{x}{2}$
$cos~\frac{x}{2} = \frac{y}{3}$
$\frac{x}{2} = arccos(\frac{y}{3})$
$x = 2~arccos(\frac{y}{3})$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 6 - Review Exercises - Page 286: 58
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