Answer
a. $\frac{1}{16}$
Work Step by Step
We know that-
$\cos^{2}\theta$ = $(\cos\theta)^{2}$
Substituting the value of $\cos\theta$
$\cos^{2}\theta$ = $(\frac{1}{4})^{2}$ = $\frac{1}{16}$
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 41: 65
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