The graph of a cosine function is shown. plot the line that represents the midline of the given periodic function.

y=3 is the midline of the given cosine function.

Step-by-step explanation:

The midline is a horizontal axis that acts as a reference line about which a graph of a periodic function oscillates.

It is the average of maximum and minimum values of the function.

The maximum value of the cosine function is y=4

The minimum value of the cosine function is y=2

∴ The midline of the cosine function = (4+2)/2 = 3

Hence, y=3 is the midline of the given cosine function.

Refer attachment for the graph.

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