Calculate the amplitude of trigonometry function, Mathematics

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Consider the trigonometric function f(t) = -3 + 4 cos(Π/ 3 (t - 3/2 )).

(a) What is the amplitude of f (t)?

(b) What is the period of f(t)?

(d) Sketch the graph of f(t) for t ∈ [-6; 6].

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