Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 3 - Review Exercises - Page 129: 38

Answer

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Work Step by Step

The angle $-13\pi$ teminates on the negative x-axis. Note that the value of tangent of an angle whose terminal side is the negative x-axis is $0$. Recall: $\cot{\theta} = \dfrac{1}{\tan{\theta}}$ Thus, $\cot{(-13\pi)} = \dfrac{1}{\tan{-13\pi}}=\dfrac{1}{0}, \text{ undefined}$
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