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Answer :

We see that:

• the graph has the same shape as the graph of the cosine function,

,

• the amplitude of the graph is A = 4,

,

• the period of the function is T = π.

The function of the graph is:

[tex]f(x)=4\cdot\cos (2x).[/tex]

Answer

C. y = 4 cos(2x)

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