Respuesta :

A cosine function is given in the form:

[tex]y=A\cos(x-h)+k[/tex]

where |A| is the amplitude, h is the horizontal shift (also called a phase shift) and k is the vertical shift.

The function is given to be:

[tex]\begin{gathered} y=8\cos(\frac{1}{4}x) \\ A=8 \end{gathered}[/tex]

Therefore, the amplitude is 8.

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