Answer
$36.49^{\circ}$
Work Step by Step
Ensuring that the calculator is in degree mode, we enter $\cos^{-1} (0.80396577)$ into the calculator and solve:
$\cos^{-1} (0.80396577)\approx36.49^{\circ}$
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 6 - Review Exercises - Page 285: 19
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