\[\text{S}=\frac{1+\beta}{1-\beta \frac{\text{d} \text{I}_{\text{B}}}{\text{d} \text{I}_{\text{C}}}}=1+\beta\]
\[S=\frac{1+\beta}{1+\beta \frac{\text{R}_{\text{C}}}{\text{R}_{\text{C}}+\text{R}_{\text{B}}}}\]
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