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Answer :

f(x)= 5cos(x) +3

1) Considering a generic cosine function as y= Acos(Bx +C) +D the amplitude, or half the length between the highest point of the curve is found by:

[tex]Amplitude\colon\text{ |A|}[/tex]

2) Examining the given options, then we can state that f(x)= 5cos(x) +3 has an amplitude of 5 units

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