Answer
$\sqrt 3$
Work Step by Step
cot(-120°)=cos(-120°)/sin(-120°)=-cos30°/-sin30°=$\sqrt 3$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 6 - Section 6.3 - Trigonometric Functions of Angles - 6.3 Exercises - Page 499: 17
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