Answer
All the real numbers except $x=0$.
Work Step by Step
$f(x)=\frac{sin~x}{x}$
The denominator cannot be equal to $0$. Hence, $x\ne0$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.3 - Solving Trigonometric Equations - 7.3 Exercises - Page 531: 87a
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