Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - Chapter 7 Test Prep - Review Exercises - Page 736: 17


$17\rightarrow I$

Work Step by Step

$\cos \left( 210\right) =\cos \left( 150+60\right) =\cos 150\cos 60-\sin 150\sin 60$ $17\rightarrow I$
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