Find the fourier-series expansion of the pulse train, Electrical Engineering

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The rectangular pulse train of Figure (a) consists of pulses of height A and duration D. Such pulse trains are employed for timing purposes and to represent digital information. For a particular pulse train, A = 3 and the duty cycle D/T = 1/3.

(a) Find the Fourier-series expansion of the pulse train.

(b) Sketch the line spectrum of the rectangular pulse train when T = 1 ms.

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