Answer
$\approx 0.309$
Work Step by Step
We are asked to use a calculator to compute the result in radian mode and then round-off the result to three decimal places.
We get:
$\cos (\dfrac{2 \pi}{5})=0. 30901699437 \approx 0.309$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 5 - Trigonometric Functions - Chapter Test - Page 460: 14
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