Answer
False.
Work Step by Step
Please note that the only function whose graph is the same as its inverse is $y=x$. So the graph of the functions $y=\sec \frac{x}{2} = \frac{1}{\cos \frac{x}{2}}$ and $\cos \frac{x}{2}$ are not the same.
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 - Concept and Vocabulary Check - Page 609: 7
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