Find the inverse laplace transform of

$\displaystyle e^{-pi(s)}/(s^2+9)

$

what i think it is,

$\displaystyle (1/3)u(t-pi)sin3t$

am not sure if am gettin the concept of this second shifting or should it be

$\displaystyle 1/3*u(t+pi)sin3(t+pi)$

any help will be appreciated thanks, if someone can please expain to me so i get the concep of the second shift in my head thanks!