Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises: 108

Answer

$40^{\circ}$

Work Step by Step

1. Arc cosine $\cos^{-1} (0.766)=40.00396^{\circ}$
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