Find x(t) for each of the following Laplace transforms:
(a) X(s) = 1/s²+9
(b) X(s) = 4s/s²+4s+3
(c) X(s) = 26+2s/s(s²+4s+13)
(d) X(s) = s(s−1)/s⁴−1
(e) X(s) = se−π/s²+1
(f) X(s) = 12/(s+2)²(s+4)