Calculus (3rd Edition)

Published by W. H. Freeman
ISBN 10: 1464125260
ISBN 13: 978-1-46412-526-3

Chapter 1 - Precalculus Review - 1.4 Trigonometric Functions - Exercises - Page 29: 1



Work Step by Step

$\frac{13\pi}{4}=3\pi+ \frac{\pi}{4}=(2\pi+\pi+\frac{\pi}{4})=\pi+\frac{\pi}{4}$ (as angle repeats after $2\pi$). So, angle $\frac{13\pi}{4}= \pi+\frac{\pi}{4}=\frac{5\pi}{4}$ and $\frac{5\pi}{4}$ is in between 0 and $2\pi$.
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