The sinusodial modulating wave m(t) = (am)cos(2*pi*fm*t) is applied to a phase modulator with sensitivity kp. the unmodulated carrier wave has frequency fc and amplitude ac. determine the spectrum of the resulting phase-modulated wave, assuming that the maximum phase deviation b = kp*am does not exceed 0.3 radian.
also, by assuming bp is less than equal to 0.3 rad, you can approximate cos[bp*cos(2*pi*fm*t)] = 1.0 and
sin[bp*cos(2*pi*fm*t) = bm*sin(2*pi*fm*t)
also need the specturm s(f) base on above appoximation.