Answer
$\pm \sqrt {1-\cos ^{2}x}$
Work Step by Step
$\sin ^{2}x+\cos ^{2}x=1\Rightarrow \sin ^{2}x=1-\cos ^{2}x\Rightarrow \sin x=\pm \sqrt {1-\cos ^{2}x}$
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 - 7.1 Fundamental Identities - 7.1 Exercises - Page 659: 47
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