A modulating signal m(t) is given by: (a) m(t) = cos 100π1 + 2 cos 300TI (b) m(t)sin 100mt sin 500mt In each case: (i) Sketch the spectrum of m(t) (ii) Find and sketch the spectrum of the DSB-SC signal 2,n(t) cos 1000π. (iii) From the spectrum obtained in part (, suppress the LSB spectrum to obtain the USB spectrum. (iv) Knowing the USB spectrum in part (ii), write the expression φUSB (t) for the USB signal. (v) Repeat parts (iii) and (iv) to obtain the LSB signal PLSB ().