Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 4 - Section 4.1 - Basic Graphs - 4.1 Problem Set - Page 192: 37

Answer

0.5

Work Step by Step

Since cosine is an even function, $\cos(-x)=\cos(x)$. Therefore, $\cos(-60^{\circ})=\cos(60^{\circ})$. $60^{\circ}$ is a special trigonometric angle, where the value of $\cos(60^{\circ})$ is 0.5. Therefore, $\cos(-60^{\circ})=0.5$.
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