In Figure, four discrete-time signals are plotted. Match each sinusoid listed below with one of the signals plotted in Figure.
(a) x1[n] = 3 cos (2πn)
(b) x2[n] = 5 cos (πn)
(c) x3[n] = 5 cos(πn /2)
(d) x4[n] = 5 sin (πn)
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