## Trigonometry (10th Edition)

Published by Pearson

# Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises: 106

#### Answer

$\cos(-x)=\cos x$

#### Work Step by Step

1. Set up calculator in degrees $\cos20^{\circ}\approx0.9397$ $\cos(-20)^{\circ}\approx0.9397$ 2. Pick up more examples $\cos60^{\circ}=0.5$ $cos(-60)^{\circ}=0.5$

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