Answer
See below
Work Step by Step
We are given that $F(s)=\frac{e^{-3s}}{s^2+1}$
Now,$f(t)= L^{-1}[\frac{e^{-3s}}{s^2+1}]\\
=\sin (t-3)u_3t)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.