Consider the following signals, sketch each one of them and comment on the periodic nature:

(a) x(t) = A cos(2πf₀t + θ), where A, f₀, and θ are the amplitude, frequency, and phase of the signal.

(b) x(t) = e^j(2πf0t+θ) , A> 0.

(c) Unit step signal u_-1(t) defined by u_-1(t) =

(d) Discrete-time signal x[n] = A cos(2πf₀n + θ), where n is an integer.

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