Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 6 - The Circular Functions and Their Graphs - 6.2 The Unit Circle and Circular Functions - 6.2 Exercises: 56

Answer

$\color{blue}{\approx 1.3 \text{ radians} \\\approx 5 \text{ radians}}$

Work Step by Step

To approximate the angle whose cosine value is $0.3$, look up in the given figure the angle/s directly above and directly below $x=0.7$ These angles are approximately $1.3$ radians and $5$ radians Thus, the angles are approximately: $\color{blue}{1.3 \text{ radians} \\5 \text{ radians}}$
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