Answer
False
Work Step by Step
$\sin 39^{\circ}48' + \cos 39^{\circ} 48' =? 1$
$0.6401096995 + 0.7682835236 =? 1$
$1.408393223 \ne 1$
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: 53
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