Answer
$\frac{tan~68°-tan~115°}{1+tan~68°~tan~115°}=-tan~47°$
Work Step by Step
$tan(u-v)=\frac{tan~u-tan~v}{1+tan~u~tan~v}$
$\frac{tan~68°-tan~115°}{1+tan~68°~tan~115°}=tan (68°-115°)=tan(-47°)=-tan~47°$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - Review Exercises - Page 552: 52
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