Precalculus (6th Edition) Blitzer

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: 39

Answer

$\frac{\sqrt 2}{2}$

Work Step by Step

cos($\frac{\pi}{4}$ + 2$\pi$) = cos$\frac{\pi}{4}$ and cos$\frac{\pi}{4}$ = $\frac{\sqrt 2}{2}$.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.