Answer
$0,\pi,2\pi$
Work Step by Step
From the graph plotted earlier, it is clear that the values of x at which cot x is undefined such that $0\leq\,x\leq2\pi$ are $0,\pi,2\pi$.
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 4 - Section 4.1 - Basic Graphs - 4.1 Problem Set - Page 192: 34
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