Use the method of Variation of Parameters to find a particular solution to the 2nd order non-homogeneous linear differential equation y′′+4y=sin²(2x) given the general solution yc=C1 cos(2x)+C2 sin(2x) to the associated homogeneous equation. OR Use the method of Variation of Parameters to find a particular solution to the 2nd order non-homogeneous linear differential equation y′′−4y′+3y=x given the general solution y0=C1eˣ+C2e³ˣ to the associated homogeneous equation.