## Precalculus (6th Edition) Blitzer

Published by Pearson

# Chapter 4 - Section 4.5 - Graphs of Sine and Cosine Functions - Exercise Set - Page 596: 61

#### Answer

$$y=3\cos \frac{x}{2}$$

#### Work Step by Step

Looking at the graph, we find that this is the graph of a cosine function with amplitude $3$ and period $4\pi$. So, we conclude that$$A=3, \quad B=\frac{2\pi }{4\pi }=\frac{1}{2} \\ \Rightarrow \quad y=A \cos Bx = 3 \cos \frac{x}{2}.$$

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