4.3-5. Find the system response at the sampling instants to a unit-step input for the system of Fig. P4.3-5. E(x)= -ET s+1 S T=1s FIG. P4.3-5 System for Problem 4.3-5. Fio D4.3.6 fox (1 C(s) 5s (x+1)(x+3) funation