Answer
At integer values of $ x $.
Work Step by Step
By plotting the function, we see that at integer values of $ x $, the function is discontinuous, so the derivative does not exist at these values.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 3 - Differentiation - 3.2 The Derivative as a Function - Exercises - Page 116: 72
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