5.1-3 Over an interval |r| s 1, an angle-modulated signal is given by VEM (1) = 10 cos 13, 000rt It is known that the carrier frequency we = 10,000r. (a) If this were a PM signal with kp = 1000, determine m(t) over the interval |r| s 1. (b) If this were an FM signal with kf = 1000, determine m(t) over the interval |1| < 1.