Answer
Please see below.
Work Step by Step
Please note that an interval containing two periods can be found by solving the following inequality:$$-\frac{\pi }{2} \lt \frac{x}{4} \lt \frac{3\pi }{2} \quad \Rightarrow \quad -2\pi \lt x \lt 6\pi$$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.6 - Graphs of Other Trigonometric Functions - Exercise Set - Page 609: 6
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