Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - 7.4 Double-Angle and Half-Angle Identities - 7.4 Exercises - Page 694: 72


$\tan 79.1$

Work Step by Step

$\dfrac {\sin 158.2}{1+\cos 158.2}=\dfrac {2\sin \dfrac {158.2}{2}\times \cos \dfrac {158.2}{2}}{2\cos ^{2}\dfrac {1582}{2}}=\tan \dfrac {158.2}{2}=\tan 79.1$
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