Solving a circuit using superposition (strange case)
I spoke with my professor, and he said that the case that Va = 0 is not strange at all. He said it depends on the design of the circuit, therefore, the answer I have previously posted, where the circuit simplifies down and Vo1 = -IsR3, is correct. From my understanding then, it is due to the fact that the dependent current source is dependent upon a branch which is dependent upon the dependent current source in terms of the connection to the rest of the circuit, which makes Va equal to zero, logically; there is no independent source within the branch of Va.