opAmp circuit (vout vs. inputs).

1. Derive the equation of the following opAmp circuit (vout vs. inputs). Figure 1 2. How does the input impedance of the circuit in figure 1 compare to a standard opAmp? 3. The following circuit in figure 1 is given as an alternative circuit to the one in step 1 and 2. Derive the equation of the circuit (Vout/Vin) and compare the input impedance of this circuit with the circuit in step 2.