= e-tas Using the substitution s = iw, obtain expressions for AR and phase shift for the following cases for a frequency response analysis. Sketch using asymptotic analysis. a. Pure capacity system, Gp = Kp/s b. FOPDT system, Gp Kp (1+rs) C. Time delay system Gp = e-tas d. Pl controller, Gc = Kc(1+ e. PID controller, Gc = Kc(1+ ++ +tos) = = TIS = TIS