an FM modulator has ouput
s(t) = A Cos[ (2*pi*fc*t)+beta*sin(2*pi*fm*t)]
a- for this modulator a 1-v signal produces a deviation of 20Khz determine the amplitude and phase spectra of s(t) for the modulating signal m(t) = 1.5 cos(2*pi*6*10^4*t) when fc>>fm
b- find the bandwidth of the modulated signal using carson's rule.