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Exercise 1.1 Referring to Figure 1.9, Eq. (1.5) is used to write KCL at the internal node according to (E.1):
The voltage at the internal node can be written using Eq. (1.5) according to (E.2):
Solving (E.2) for yields
Substituting for using (E.3) into (E.1) results in (E.4):
Substituting (E.4) ...