Answer
$x = \frac{arccos~y}{3}$
Work Step by Step
$y = cos~3x$, where $x~in~[0,\frac{\pi}{3}]$
$3x = arccos~y$
$x = \frac{arccos~y}{3}$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 6 - Test - Page 294: 18a
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