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a)What is the formula for the gain of an inverting operational amplifier circuit with input resistor...

a)What is the formula for the gain of an inverting operational amplifier circuit with input resistor Ri and feedback resistor Rf? Draw the circuit.

b)What is the formula for the gain of a non-inverting operational amplifier circuit with input resistor Ri and feedback resistor Rf? Draw the circuit.

c)What is the gain of a voltage follower operational amplifier circuit? What is the input impedance of this circuit? Draw the circuit.

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