From the quiescent values determine the small-signal

Question

The circuit in given Figure has transistor parameters: h_F E = 100, V_B E (on) = 0.7 V, and V_A = ∞.

(a) From the quiescent values, determine the small-signal parameters for Q₁ and Q₂.

(b) Using nodal analysis, determine the small-signal closed-loop current gain A_{i f} = i_o/i_s.

(c) Using nodal analysis, find the input resistance R_{i f}.