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The message signal s(t) = 2cos(6mt) + 0.5sin(1071) modulates the carrier signal c(t) = A cos(100pit) using DSB-SC AM scheme. a.Write an expression for the modulated signal x(t). b. Determine and sketch the spectrum of the modulated signal x(t). c. Calculate the average power contained in the modulated signal x(t).

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