Answer
cosine and secant
Work Step by Step
Only cosine and secant functions are even.
Because,$\,\, cos(-x) = cos(x)$,
and , $\,\,sec(-x) = sec(x)$.
The rest of the functions are odd functions.
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: 12
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