1. The problem statement, all variables and given/known data Find input resistance of the ckt (see attached) 2. Relevant equations 3. The attempt at a solution Q2 is diode connected, so I replaced Q2 with VBE resistance (rbe or r∏). So, Rin is rbe1+(β+1)rbe2 But the answer is somewhat different, it's rbe1+ (β+1) (rbe2||1/gm2) Where did 1/gm2 come from?