Answer
$(-\infty,-3)U(-3,3)U(3,\infty)$
Work Step by Step
The domain requirement for $h(x)$ is $x^2-9\ne0$ which gives $x\ne\pm3$ or $(-\infty,-3)U(-3,3)U(3,\infty)$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 6 - Trigonometric Functions - 6.1 Angles and Their Measure - 6.1 Assess Your Understanding - Page 365: 135
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