Answer
$45^{o}$
Work Step by Step
If $\cos(\theta)=\frac{\sqrt2}{2}$, then $\theta=\cos^{-1}(\frac{\sqrt2}{2})=45^{o}.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 8 - Applications of Trigonometric Functions - 8.3 The Law of Cosines - 8.3 Assess Your Understanding - Page 537: 2
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