Answer
$=-\frac{\sqrt 3}{3}$
Work Step by Step
$cot(-\frac{13\pi}{3})$
$=\frac{1}{tan(-\frac{13\pi}{3})}$
$=-\frac{\sqrt 3}{3}$
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Chapter 1 - Functions - 1.4 Trigonometric Functions and Their Inverse - 1.4 Exercises - Page 48: 19
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