Answer
a)
Work Step by Step
The period of a graph $y=a\sec (bx+c)$ can be obtained by (if $a,b$ are non-zero): $\frac{2\pi}{|b|}$.
Hence here the period: $\frac{2\pi}{\frac{\pi}{2}}=4$, thus the answer is a)
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 4 - Section 4.4 - The Other Trigonometric Functions - 4.4 Problem Set - Page 231: 78
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