Calculus with Applications (10th Edition)

Published by Pearson
ISBN 10: 0321749006
ISBN 13: 978-0-32174-900-0

Chapter 13 - The Trigonometric Functions - Chapter Review - Review Exercises - Page 701: 28



Work Step by Step

We are given $\tan120^\circ$ We can find the value by using right-angled triangle create by x, y, r and $\theta=60^\circ$ From the $30^\circ-60^\circ-90^\circ$ we will have $x=-1, y=1, r=1$ Using the definitions of the trigonometric functions give the following result $tan120^\circ=-1$
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