Answer
$g(x)$ is the reflection over the $x$-axis of $f(x)$
Work Step by Step
We are given:
$f(x)=\cos 2x$
$g(x)=-\cos 2x$
There is a negative in $g(x)$ comparing to $f(x)$, so that shows a reflection over the $x$-axis.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 6 - 6.4 - Graphs of Sine and Cosine Functions - 6.4 Exercises - Page 464: 15
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