Chebyshev2FilterModel
Chebyshev2FilterModel[n] creates a lowpass Chebyshev type 2 filter of order n.
Chebyshev2FilterModel[{n,ωc}] uses the cutoff frequency ωc.
Chebyshev2FilterModel[{"type",spec}] uses the full filter specification {"type",spec}.
Chebyshev2FilterModel[{"type",spec},var] expresses the model in terms of the variable var.
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