Derive Equation (10.25) for the spectrum of an MSK signal by multiplying |G(f)|², given by (10.23), times S_BPSK (f), given by (10.24). That is, show that serial modulation of MSK works from the standpoint of spectral arguments. (Work only with the positive-frequency portions of (10.23) and (10.24) to produce the first term of (10.25); similarly work with the negative-frequency portions to produce the second term of (10.25). In so doing you are assuming negligible overlap between positive- and negative-frequency portions.)