Answer
False
Work Step by Step
$\frac{1}{2} \sin 40^{\circ} = \sin [\frac{1}{2}\times 40^{\circ}]$
$ \frac{1}{2} \sin (40^{\circ})= 0.3213938048 $
$\sin (20^{\circ}) = 0.3420201433$
$0.3213938048\ne 0.3420201433$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 2 - Acute Angles and Right Triangles - Section 2.3 Finding Trigonometric Function Values Using a Calculator - 2.3 Exercises - Page 65: 54
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