Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 4 - Section 4.2 - Trigonometric Functions: The Unit Circle - Exercise Set - Page 548: 70


$\approx 5.6713$

Work Step by Step

RECALL: $\cot{x} = \dfrac{1}{\tan{x}}$ Use the rule above to obtain: $\cot{(\frac{\pi}{18})}=\dfrac{1}{\tan{(\frac{\pi}{18})}}$ Use a calculator in RAD mode then round-off the answer to four decimal places to obtain: $\cot{(\frac{\pi}{18})} \approx 5.6713$
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