Answer
$3\rightarrow B$
Work Step by Step
$2\sin \alpha \cos \alpha =\sin 2\alpha \Rightarrow 2\sin 22.5\cos 22.5=\sin \left( 2\times 22.5\right) =\sin 45=\dfrac {\sqrt {2}}{2}$
$3\rightarrow B$
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 - 7.4 Double-Angle and Half-Angle Identities - 7.4 Exercises - Page 692: 3
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