13.84. (a) What are the Q-points of the transistors in the amplifier in Fig. P13.84. if VCC = 20 V, VEE = 20 V, I1 = 200 μA, I2 = 400 μA, I3 = 1 mA, βF = 100, and VA = 50 V? (b) What are the differential-mode voltage gain and input resistance? (c) What is the amplifier output resistance? (d) What is the common-mode input resistance? (e) Which terminal is the noninverting input?