Answer
The derivative is zero or undefined/infinite.
Work Step by Step
The critical point definition is a point on the graph of a function where the derivative is zero or undefined/infinite.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 4 - Applications of the Derivative - 4.2 Extreme Values - Preliminary Questions - Page 180: 1
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