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If $[f(t)]=\mathrm{F}(s)$, then $[f(t-\mathrm{T})]$ is equal to

  1. $e^{s \mathrm{T}} \mathrm{~F}(s)$
  2. $e^{-s \mathrm{T}} \mathrm{~F}(s)$
  3. $\frac{\mathrm{F}(s)}{1-e^{s T}}$
  4. $\frac{\mathrm{F}(s)}{1-e^{-\mathrm{sT}}}$
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