The below message signal is transmitted as an angle-modulated signal. The modulation system has ωc = 20π×106 rad/s. a) Let kf = 200000π. Sketch the frequency-modulated signal φFM(t) in the time domain. b) Let kP = 50π. Sketch the phase-modulated signal φPM(t) in the time domain. Write the frequency details in your sketch.