Answer
$ 0,\pm\pi,\pm2\pi$.
Work Step by Step
$y=cot(x)$ has vertical asymptotes when $x=k\pi$ (k is an integer). Within $[-2\pi,2\pi]$, we have $x=0,\pm\pi,\pm2\pi$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Section 5.5 Graphs of the Tangent, Cotangent, Cosecant, and Secant Functions - 5.5 Assess Your Understanding - Page 441: 16
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