5.1-2 A baseband signal m(t) is the periodic sawtooth signal shown in Fig. P5.1-2. (a) Sketch (t) and M (1) for this signal m(() if we = 210 x 10, ky = 2000x, and kn = 1/2 (b) Show that the PM signal is equivalent to a PM signal modulated by a rectangular periodic message. Explain why it is necessary to use ky