Answer
$\sin$ and $\cos$ have defined amplitudes.
Work Step by Step
The trig functions that are not $\sin$ and $\cos$ all have vertical asymptotes, which result in an undefined amplitude
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 4.1 - Basic Graphs - 4.1 Problem Set - Page 192: 7
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