Answer
$\cos^{2}\theta$ =$\frac{1}{9}$
Work Step by Step
We know that-
$\cos^{2}\theta$ = $(\cos\theta)^{2}$
Substituting the value of $\cos\theta$
$\cos^{2}\theta$ = $(\frac{1}{3})^{2}$ =$\frac{1}{9}$
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 1 - Section 1.4 - Introduction to Identities - 1.4 Problem Set - Page 40: 24
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