Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - 7.3 Sum and Difference Identities - 7.3 Exercises - Page 679: 62

Answer

$-1$

Work Step by Step

$\dfrac {\tan 80-\tan \left( -55\right) }{1+\tan {80}\tan \left( -55\right) }=\tan \left( 80-\left( -55\right) \right) =\tan 135=-1$
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