Determine the common-mode gain

Question

Response to the following :

A bipolar differential amplifier with I =0.5 mAutilizes transistors for which VA = 50 V and β = 100. The collector resistances RC = 5 kΩ and are matched to within 10%. Find:

(a) The differential gain

(b) The common-mode gain and the CMRR if the bias current I is generated using a simple current mirror

(c) The common-mode gain and the CMRR if the bias current I is generated using a Wilson mirror. (Refer to Eq.  for Ro of the Wilson mirror.)

R_o=β₃r_o3/2