Precalculus (10th Edition)

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: 16



Work Step by Step

I use a calculator in radian mode and then round the result, hence: $\cot(\frac{28\pi}{9})=\dfrac{1}{\tan(\frac{28\pi}{9})}=2.74748\approx2.747.$
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