Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 5 - Trigonometric Functions - Section 5.3 Properties of the Trigonometric Functions - 5.3 Assess Your Understanding - Page 418: 84

Answer

$1$

Work Step by Step

Recall: $\tan{(\theta+180^{\circ})} = \tan{\theta}$ This means that $\tan{200^{\circ}} = \tan{(20^{\circ}+180^{\circ})} = \tan{20^{\circ}}$ Thus, $\tan{200^{\circ}} \cdot \cot{20^{\circ}} = \tan{20^{\circ}}\cdot \cot{20^{\circ}}$ Since $\cot{\theta} = \dfrac{1}{\tan{\theta}}$, then $\cot{20^{\circ}} = \dfrac{1}{\tan{20^{\circ}}}$ Therefore, $\tan{20^{\circ}}\cdot \cot{20^{\circ}} = \tan{20^{\circ}}\cdot \dfrac{1}{\tan{20^{\circ}}} = \boxed{1}$
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