Answer
The function is even. Notice that the function is symmetric with respect to the y-axis.
$f(x)=f(-x)$, that is, $sec~x=sec(-x)$
Work Step by Step
$sec(-x)=\frac{1}{cos(-x)}=\frac{1}{cos~x}=sec~x$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 6 - 6.5 - Graphs of Other Trigonometric Functions - 6.5 Exercises - Page 476: 57
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