Answer
$-\frac{1}{3}$
Work Step by Step
Since cosine is an even function, $\cos(-\theta)=\cos(\theta)$.
As $\cos(\theta)=-1/3$, $\cos(-\theta)=-1/3$.
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 4 - Section 4.1 - Basic Graphs - 4.1 Problem Set - Page 192: 46
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