Answer
(a)
Work Step by Step
The function that is not differentiable at $a$ and $b $ and decreasing at $c$ is $(a)$.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 4: Applications of Derivatives - Section 4.1 - Extreme Values of Functions - Exercises 4.1 - Page 191: 14
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