The message signal in a DSB-AM system is of the form m(t) = 12 cos(6t) + 3 cos(10nt) (a) Calculate the message power, Pm. (b) If this message is DSB-AM modulated on a carrier with amplitude Ac, calculate the Fourier series of x(t). (c) Assuming fe = 20 Hz calculate the Fourier series of x(t) and plot the resulting time waveform when A. = 1. (d) Compute the output power of the modulated signal, P. (e) Calculate and plot xp (t). Computer might be useful.