Solve the Differential equation :- ( D²- 3DD' + 2D'²)z = cos (x+2y) + e^3x-y
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Solve the Differential equation :- ( D²- 3DD' + 2D'²)z = cos (x+2y) + e^3x-y
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cos(x+2y)+ e^3x-y=cos (x+2y) + e^3x-y
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