0 9.20. In Figure P9.20, four discrete-time signals are plotted. Match each sinusoid listed below with one of the signals plotted in Figure P9.20. -10 -10 (a) x₁[n] = 3 cos (4πn) (c) x3[n] = 5 5 cos(4πn/8) Signal A in -5 0 n Signal C 0 16 5 5 10 10 3 2.5 2 1.5 1 0.5 0 -10 -5 -5 -10 -5 (b) x₂[n] = 5 cos (3πn) 5 sin (3πn) (d) x4[n] = Signal B 0 n Signal D 0 n 10 5 5 10 10 Figure P9.20

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9.20. In Figure P9.20, four discrete-time signals are plotted. Match each sinusoid listed below
with one of the signals plotted in Figure P9.20.
-10
-10
(a) x₁[n] = 3 cos (4πn)
(c) x3[n] = 5 5 cos(4πn/8)
Signal A
in
-5
0
n
Signal C
0
16
5
5
10
10
3
2.5
2
1.5
1
0.5
0
-10 -5
-5
-10
-5
(b) x₂[n] = 5 cos (3πn)
5 sin (3πn)
(d) x4[n]
=
Signal B
0
n
Signal D
0
n
10
5
5
10
10
Figure P9.20
Transcribed Image Text:0 9.20. In Figure P9.20, four discrete-time signals are plotted. Match each sinusoid listed below with one of the signals plotted in Figure P9.20. -10 -10 (a) x₁[n] = 3 cos (4πn) (c) x3[n] = 5 5 cos(4πn/8) Signal A in -5 0 n Signal C 0 16 5 5 10 10 3 2.5 2 1.5 1 0.5 0 -10 -5 -5 -10 -5 (b) x₂[n] = 5 cos (3πn) 5 sin (3πn) (d) x4[n] = Signal B 0 n Signal D 0 n 10 5 5 10 10 Figure P9.20
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can you explain why we checked x3(0) but we didnt check it for x1 and x2. also, why are we checking x(0), what does it show? 

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