What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor?

In a standard operational amplifier circuit, the gain is determined by the ratio of the feedback resistor to the input resistor. When you place a capacitor in parallel with the feedback resistor, you introduce frequency-dependent reactance into the feedback loop. At low frequencies, the capacitor acts like an open circuit (high reactance), so the gain is dictated purely by the feedback resistor and remains high. At high frequencies, the capacitor's reactance drops, lowering the overall impedance of the feedback loop. Because lower feedback impedance results in lower amplifier gain, the circuit reduces the amplitude of high-frequency signals while passing low-frequency signals normally. This behavior defines a low-pass filter.