Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 6 - Review Questions - Page 501: 66

Answer

.2225

Work Step by Step

We first double check our calculator is in the correct mode. If there is a degree symbol next to the angle, put the calculator in degrees. If there is no symbol next to the number, put the calculator in radians. Doing this, we find: $$cos(-\frac{25\pi}{7})=.2225$$
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