Answer
$\dfrac {\sqrt {7}}{4}$
Work Step by Step
$\sin \left( \arccos x\right) =\sqrt {1-x^{2}}\Rightarrow \sin \left( \arccos \dfrac {3}{4}\right) =\sqrt {1-\left( \dfrac {3}{4}\right) ^{2}}=\dfrac {\sqrt {7}}{4}$
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 - Chapter 7 Test Prep - Review Exercises - Page 738: 99
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