Answer
$ 0$
Work Step by Step
$cos(-\frac{5\pi}{4})-cos\frac{3\pi}{4}\\=cos(\frac{5\pi}{4})-cos\frac{3\pi}{4}\\=cos(\pi+\frac{\pi}{4})-cos(\pi-\frac{\pi}{4})\\=-cos\frac{3\pi}{4}+cos\frac{3\pi}{4}\\=0$
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 5 - Trigonometric Functions - Chapter Test - Page 460: 8
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