Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 2 - Review Exercises - Page 93: 3


$B = 10^{\circ}$

Work Step by Step

Use the concept of cofunction: $\sin x = \cos (90^{\circ} -x)$ $\sin 4B = \cos (90^{\circ} -5B)$ $4B = 90^{\circ} -5B$ $B= 10^{\circ}$
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