9. Method of undetermined coefficients y" -y = 3et ○ y = c₁e³ + c₂e²¹ + 1/{xe* -X y = ₁² + c₂e²x + 3xe* y = ² ( y = C₁ cos x + c₂ sinx + xe* x + c₂ sinx + 2xe*)

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