Answer
$ \frac{\pi}{4}$
Work Step by Step
Based on the given conditions, we have:
$cos^{-1}(\frac{1}{\sqrt 2})=cos^{-1}(\frac{\sqrt 2}{2})=\frac{\pi}{4}$
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 8 - Polar Coordinates; Vectors - Section 8.7 The Cross Product - 8.7 Assess Your Understanding - Page 653: 64
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