Answer
$\frac{1}{4}(2+\sqrt 2)$
Work Step by Step
$ cos^2\frac{\pi}{8}=\frac{1}{2}(cos\frac{\pi}{4}+1)=\frac{1}{4}(2+\sqrt 2)$
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 1: Functions - Section 1.3 - Trigonometric Functions - Exercises 1.3 - Page 28: 47
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