3. Find E*(8) for B(s) s(s+1) [20] 4. Given the signal e(t)-3 sin4t+2sin 7t. [20] a. List all the frequencies less than 0-5Orad's that are present in et). b. The signal e(t) is sampled at the frequency os - 22 rad's. list all the frequencies present in e(t) that are less than w-50 rad's. c. The signal e*(t) is applied to a zero-order hold. List all frequencies present in the hold output that are less than 0-5Orad/s