Answer
$B = 10^{\circ}$
Work Step by Step
Use the concept of cofunction: $\sin x = \cos (90^{\circ} -x)$
$\sin 4B = \cos (90^{\circ} -5B)$
$4B = 90^{\circ} -5B$
$B= 10^{\circ}$
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 - Review Exercises - Page 88: 3
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