(a) Consider the ideal op-amp circuit shown in Figure P9.51. Determine the voltage gains \(A_{v 1}=v_{O 1} / v_{I}\) and \(A_{v 2}=v_{O 2} / v_{I}\). What is the relationship between \(v_{O 1}\) and \(v_{O 2}\) ?

(b) For \(R_{2}=60 \mathrm{k} \Omega, R_{1}=20 \mathrm{k} \Omega\), and \(R=50 \mathrm{k} \Omega\), determine \(v_{O 1}\) and \(v_{O 2}\) for \(v_{I}=-0.50 \mathrm{~V}\).

(c) Determine \(\left(v_{O 1}-v_{O 2}\right)\) for \(v_{I}=+0.8 \mathrm{~V}\).

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