Answer
$A=D$.
Work Step by Step
Because the set $D$ does not contain its boundary points $-1$ and $3$, it is equal to the set $A$.
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
Published by
Cengage Learning
ISBN 10:
0-49539-132-8
ISBN 13:
978-0-49539-132-6
Chapter 1 - Speaking Mathematically - Exercise Set 1.2 - Page 13: 5
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