Answer
b)
Work Step by Step
Since we are looking for the zeros of the left side it is a good idea to factor $\cos x$ from the left side, thus the answer is b)
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 6 - Section 6.1 - Solving Trigonometric Equations - 6.1 Problem Set - Page 328: 86
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