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This paper presents a new software which can generate in full-symbolic or numeric-symbolic form the Y, Z, H, and fundamental parameters of a two-port structure. Our procedure can also determine all the resonant frequencies of any two-port configuration as functions of the two-port circuit parameters. The procedure is based on the modified nodal equations in full-symbolic form. A new software called ANCSYANP (Analog Circuit Symbolic Analysis Program) was elaborated. This is an interactive tool that combines symbolic and numeric computational techniques, and which uses the facilities of the symbolic simulator Maple to manipulate the symbolic expressions. An illustrative example is done.