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The Thevenin equivalent impedance $\text{Z}_{\text {th }}$ between the nodes $\text{P}$ and $\text{Q}$ in the following circuit is

  1. $1$
  2. $1+s+\frac{1}{s}$
  3. $2+s+\frac{1}{s}$
  4. $\frac{s^{2}+s+1}{s^{2}+2 s+1}$
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