P6.4-3. Determine the values of the node voltages, v_a and v_o, of the circuit shown in

Figure P6.4-3.

Figure P 6.4-3

Annotating the circuit

Using the rules of op-amps, and the rules for voltage sources in node analysis we can immediately write

We can write two voltage node equations

Use what we know () in the first of these node equations and we can find

Now we can use the second node equation

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