Answer
h is decreasing on $(0,2\pi)$
Work Step by Step
$ h(x)=\displaystyle \cos\frac{x}{2},\qquad 0$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 3 - Applications of Differentiation - 3.3 Exercises - Page 183: 14
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