Answer
$1.147$ radians
Work Step by Step
In RAD mode, use a scientific calculator and press the inverse cosine function $\cos^{-1}$
Suppose $\cos \theta =0.4112$
This gives: $ \theta \approx 1.147$ radians
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.3 - Right Triangle Trigonometry - Exercise Set - Page 561: 39
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