Algebra and Trigonometry 10th Edition

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

Chapter 7 - Review Exercises - Page 552: 52



Work Step by Step

$tan(u-v)=\frac{tan~u-tan~v}{1+tan~u~tan~v}$ $\frac{tan~68°-tan~115°}{1+tan~68°~tan~115°}=tan (68°-115°)=tan(-47°)=-tan~47°$
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