Answer
$\frac{\sqrt 2}{2}$
Work Step by Step
cos($\frac{\pi}{4}$ + 2$\pi$) = cos$\frac{\pi}{4}$ and
cos$\frac{\pi}{4}$ = $\frac{\sqrt 2}{2}$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 548: 39
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