How can i get laplace transforms

f(t)=e^at*t*cosbt (tcosbt is in down not power of e)

f(t)=t^2*e^2t

f(t)=6cosh4t (hyperbolic func)

f(t)=t^2/2+cost-1

2/(s-3)'3 inverse laplace transform

1/s(s+1) inverse laplace

6/2s-3-3+4s/9s^2-16+6-8s/16s^2+9