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If $F(s)=L[f(t)]=\dfrac{2(s+1)}{s^2+4 s+7}$ then the initial and final values of $f(t)$ are respectively

  1. $0,2$
  2. $2,0$
  3. $0, 2 / 7$
  4. $2 / 7,0$
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