Precalculus (10th Edition)

by Sullivan, Michael

Published by Pearson

ISBN 10: 0-32197-907-9

ISBN 13: 978-0-32197-907-0

Chapter 6 - Trigonometric Functions - Chapter Review - Chapter Test - Page 436: 14

Answer

$\approx0.309$

Work Step by Step

Use a calculator in radian mode and round-off the result to three decimal places to obtain $\cos(\frac{2\pi}{5})=0.30902\approx0.309$

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