Q1)Use the method of undetermined coefficients to find the general solutions of the given differential equations (a)y'"' + y" + y + y = e-t + 4t (b)yiv + y'' = sin 2t (c) yiv y'"' y" + y' = +2 +4 + tsint - C : . :.. . . . . Q1)Use the method of undetermined coefficients to find the general solutions of the given differential equations (a)y'"' + y" + y + y = e-t + 4t (b)yiv + y'' = sin 2t (c) yiv y'"' y" + y' = +2 +4 + tsint - C