(a) Plot y(t) and z(t) on the same graph, for 1st5 (with 1000 data points), such that y(t) = 3e-0.5t cos(x) z(t) = 2 - Y(1) (b) Plot the following four signals on the same graph (set the step size to 0.2) a(t) = 1 + t} .-5 < 1,