Answer
$s=\dfrac{\pi}{4}$
Work Step by Step
RECALL:
$\frac{\pi}{4}$ is a special angle and $\cos{(\frac{\pi}{4})}=\dfrac{\sqrt2}{2}$
Thus, if $\cos{s} = \frac{\sqrt2}{2}$, then $s=\dfrac{\pi}{4}$.
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 3 - Review Exercises - Page 130: 55
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