Answer
$12.733938^\circ$
Work Step by Step
Use a scientific calculator, we have $\theta=acos0.97540415\approx12.733938^\circ$ in $[0^\circ,90^\circ)$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - Chapter 5 Test Prep - Review Exercises - Page 560: 51
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