Answer
$2 e^t \sin (2t)$
Work Step by Step
Since, $F(s)=\dfrac{2}{(s+1)^2+4}$
The inverse Laplace transform of function can be expressed as:
$F(t)=L^{-1}[ F(s)] =\sin (2t)$
Now, apply the first shifting Theorem.
$f(t)= 2 e^t \sin (2t)$