Precalculus (6th Edition) Blitzer

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

Chapter 4 - Section 4.5 - Graphs of Sine and Cosine Functions - Exercise Set - Page 595: 15


Please see below.

Work Step by Step

Please note that a sine function $y=A\sin Bx$ has amplitude $|A|$ and period $\frac{2\pi }{B}$. So the function $y=-\sin \frac{2}{3} x$ has amplitude $|-1|=1$ and period $\frac{2\pi }{\frac{2}{3} }=3\pi$.
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