(a) Sketch the frequency spectrum for the signal of Figure P4.6(a), showing the dc component and the first four harmonics.
(b) Repeat Part (a) for the signal of Figure (b).
(c) Repeat Part (a) for the signal of Figure (c).
(d) Repeat Part (a) for the signal of Figure (d).
(e) Repeat Part (a) for the signal of Figure ( e).
(f) Repeat Part (a) for the signal of Figure (f).
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