Derive expressions for the Fourier coefficients of the periodic waveform in Figure P13=9. .
(a) Write an expression for the first four nonzero terms in the Fourier series.
(b) Plot the line spectrum of the Fourier coefficients \(A_{n}\) and \(\phi_{n}\).

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v() (V) 5 5s -5 -20s- 1(s)