Find the transfer functions for the following circuits (10 points / circuit) assuming ideal op amps. write your transfer function in terms of the variables r1, r2, c1, and c2 (i. e., do not use the numeric values) (b) calculate the locations of poles and zeros for the circuit (10 points / circuit). give both analytic expressions in terms of r1, r2, c1, and c2 as well as numeric values. (c) determine whether the circuit is likely to be stable or unstable (5 points / circuit) assuming the numeric values given for r1, r2, c1, and c2.