Answer
B
Work Step by Step
$\tan \left( A+B\right) =\dfrac {\tan A+\tan B}{1-\tan A\tan B}\Rightarrow 9\rightarrow B$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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 678: 9
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