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how to solve these signal please guide me its urgent?
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x1[n] = 2 cos (0.1 π n) [u[n] – u[n-20]]-----AP
x2[n] = 3sin (3n + π/3) + 4cos(πn/2 +600)----P
x3[n] = ∑_(k=-∞)^∞▒〖x 〗1[n-20k]-----------------------P
x4[n] = 5(0.8)n u[n]----------------------------AP
x5[n] = 3e^(jo2nπ)+ 4 e^(jo5nπ)-----------------------P
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