The general solution of the equation (D4+D²)y= -12 is Ay=c₁ + C₂X + c3cOSX + Casinx -3x² B y=C₁ + C₂x + c3cosx + casinx - 6x² C y=C₁ + ₂x + c3cosx + casinx + 3x² D y=C₁ + ₂x + c3cosx + csinx + 6x²

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