Answer
period $6\pi$, amplitude $1$, see graph.
Work Step by Step
Given $y=cos(\frac{x}{3})$, we can identify its period as $p=\frac{2\pi}{1/3}=6\pi$ and its amplitude as $1$, see graph.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 6 - The Circular Functions and Their Graphs - 6.3 Graphs of the Sine and Cosine Functions - 6.3 Exercises - Page 601: 26
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