Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 6 - The Circular Functions and Their Graphs - 6.2 The Unit Circle and Circular Functions - 6.2 Exercises - Page 588: 47


$\color{blue}{\cos{0.8} \approx 0.7}$

Work Step by Step

To approximate the value of $\cos{0.8}$, look for the y-value of the point where the terminal side o the angle 0.8 radian crosses the unit circle. Notice that for the given angle, the y-value of the point described above is around $0.7$. Thus, $\color{blue}{\cos{0.8} \approx 0.7}$
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