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 - Concept and Vocabulary Check - Page 547: 13


$\tan \left( t+\pi \right)=$ $\tan t$ and $\cot \left( t+\pi \right)=$ $\cot t$ , so the tangent and cotangent functions are periodic functions. The period of each of these functions is $\pi $.

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