Algebra and Trigonometry 10th Edition

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

Chapter 7 - 7.4 - Sum and Difference Formulas - 7.4 Exercises - Page 538: 39



Work Step by Step

$tan(u-v)=\frac{tan~u-tan~v}{1+tan~u~tan~v}$ $\frac{tan~\frac{9\pi}{8}-tan~\frac{\pi}{8}}{1+tan~\frac{9\pi}{8}~tan~\frac{\pi}{8}}=tan(\frac{9\pi}{8}-\frac{\pi}{8})=tan~\frac{8\pi}{8}=tan~\pi=0$
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