We want to send the message signal m(t) = 2 sin(20nt) - 8 cos(140nt) through an AM transmitter with a carrier signal c(t) = cos(2000nt). A) Find the frequency spectrum of the modulated signal and...

Extracted text: We want to send the message signal m(t) = 2 sin(20nt) - 8 cos(140nt) through an AM transmitter with a carrier signal c(t) = cos(2000nt). A) Find the frequency spectrum of the modulated signal and determine the bandwidth required to send the signal. B) Get the maximum possible modulation index (to achieve maximum power efficiency)