Solve the following ordinary differential equation using Laplace transform. Express the solution of y in terms of t. a. y" - 2y + 2y = 2 e' cos(t), y(0)=1.5, y'(0)=1.5 b. y" - 4y + 4y = (3t² + 2) e¹, y(0)=20, y'(0)=34