## Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley

# Chapter 7 - Trigonometry and Periodic Functions - 7.6 The Tangent Function - Exercises and Problems for Section 7.6 - Exercises and Problems - Page 303: 6

-1.73

#### Work Step by Step

To evaluate trigonometric functions without a calculator, it is necessary to use the unit circle. Doing this, we find that the function evaluates to: $$tan(120)=\frac{sin120}{cos120}=\frac{.866}{-.5}=-1.73$$

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