Q4. DSB-SC AM: The message signal m(t) = 2 cos(400t) + 4 sin(500+) modulates the carrier signal c(t) = A cos(8000rt), using double sideband suppressed carrier (DSB-SC) amplitude modulation. Find the time domain and frequency domain representation of the modulated signal and plot the spectrum

(Fourier transform) of the modulated signal.