3. Find the Laplace transforms : F(s) of the given functions using Laplace Transform table. \text { al } f(t)=6 \mathrm{e}^{-\mathrm{s}}+\mathrm{e}^{3 \mathrm{t}}+5 t^{3}-9 \text { b) } g(t)=4 \cos (4

t)-9 \sin (4 t)+2 \cos (10 t) \text { c) } s(t)=e^{3 t}+\cos \left(6 t^{3}\right)-e^{3 t} \cos (6 t)