# Chapter 4 - Section 4.5 - Graphs of Sine and Cosine Functions - Exercise Set - Page 596: 55

#### Work Step by Step

Please note that the graph of the function $y=\cos x -3$ (the red graph) is the graph of the function $y=\cos x$ (the blue graph) shifted down three units. The period of the graph is $\frac{2\pi }{1}=2\pi$.

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