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Q9. Find the gain
A second-order low-pass filter has poles in the Laplace variable s at
-0.25\pm j and a transmission zero at
\omega= 2.5 \text{rad}/\text{s}, where
\omega is the Fourier variable. If the DC gain is unity, find the transfer function
T(s). What is the gain of the filter when
\omega approaching infinity.