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: 71


$\tan 39.87$

Work Step by Step

$\dfrac {1-\cos 59.74}{\sin 59.74}=\dfrac {2\sin ^{2}\dfrac {59.74}{2}}{2\sin \dfrac {59.74}{2}\cos \dfrac {59.74}{2}}=\tan \dfrac {59.74}{2}=\tan 39.87$
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