Answer
$\text{even}$
Work Step by Step
Definition of even and odd functions"
If $f(x)=f(-x)$. then the function is even.
If $f(-x)= -f(x)$ then the function is odd.
Thus, if $f(x)=f(-x)$, then the function is even.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Section 5.3 Properties of the Trigonometric Functions - 5.3 Assess Your Understanding - Page 417: 2
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