Find a general solution of the differential equation y''-2y'-3y=3x^2-5
Find a general solution of the differential equation x''-3x'+2x=e^t sint
Find the solution of the initial value problem y''+y'-12y=e^2t, y(0)=1, y'(0)=3
Find the solution of the initial value problem y''-y'-2y=cosx, y(0)=0, y'(0)=-1