Answer
$\frac{\pi}{4}$.
Work Step by Step
Given $\theta$ as an acute angle (in quadrant I), we can find the solution for $cos\theta=\frac{\sqrt 2}{2}$ as $\theta=\frac{\pi}{4}$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 7 - Applications of Trigonometric Functions - Section 7.3 The Law of Cosines - 7.3 Assess Your Understanding - Page 558: 2
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