For the circuit in Figure 4, assume an ideal op amp, drive and calculate vo for V11 20 sin(2n x 60t) 0.2 sin(2n 1000t), volts %3D V12 = 20 sin(2n x 60t) + 0.2 sin(2n 1000t), volts Assume that all resistors values are equal A1 RA R2 R3 R, A3 2R R2 Figure 4