Question: Solve the partial differential equation (D - DD' - 2D')z = (2x+xy-y) sin(xy) - cos(xy). 4. Solve the partial differential equation (D2 DIY 2112): =


Solve the partial differential equation (D² - DD' - 2D'²)z = (2x²+xy-y²) sin(xy) - cos(xy).
4. Solve the partial differential equation (D2 DIY 2112): = (2x2 + xy cos(xy).
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