Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - 7.1 Fundamental Identities - 7.1 Exercises - Page 659: 47


$\pm \sqrt {1-\cos ^{2}x}$

Work Step by Step

$\sin ^{2}x+\cos ^{2}x=1\Rightarrow \sin ^{2}x=1-\cos ^{2}x\Rightarrow \sin x=\pm \sqrt {1-\cos ^{2}x}$
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