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The transfer function of a system is

$$\frac{2 s^2+6 s+5}{(s+1)^2(s+2)} $$

The characteristic equation of the system is

  1. $2 s^2+6 s+5=0$
  2. $(s+1)^2(s+2)=0$
  3. $2 s^2+6 s+5+(s+1)^2(s+2)=0$
  4. $2 s^2+6 s+5-(s+1)^2(s+2)=0$
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