Consider f (t-a) = sin (4t) and u(t-a) = u(t+2n). 4e 2nS Show that Lif (t -a) u(t-a); = $2 + 16 [8 Marks] ii) Then, solve y" +16y =1+48(t+2x) for y'(0) = y(0) =0 using Laplace transforms method