Answer
Please see below.
Work Step by Step
The red graph is the graph of $y=0.8 \sin \frac{x}{2}$, and the blue graph is the graph of $y=0.8 \sec \frac{x}{2}$.
The period of both functions are the same and equal $\frac{2\pi }{\frac{1}{2}}=4\pi$.
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 611: 83
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