Answer
See below.
Work Step by Step
The half-angle formula for $\cos(A/2)$ allows us to find the cosine of half the angle if the cosine of the angle is known.
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 5 - Section 5.4 - Half-Angle Formulas - 5.4 Problem Set - Page 303: 2
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