Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 2 - The Derivative - 2.2 The Derivative Function - Exercises Set 2.2 - Page 132: 27



Work Step by Step

A place where a function has a horizontal tangent line must have a derivative of 0. 0 is a defined number, therefore the function has to be defined at $x=a$.
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