Make a sketch of the given function on [0, ∞) and express it in terms of the unit step function: a) f(t) = = b) f(t) = 2sin(t), -2, 0. 4-t, 1, 1 0≤t<π/2 π/2 < t < 3π/2 t≥ 3π/2 0 < t <2 2 < t < 4 t>4

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