$\frac{\partial ^3z}{\partial x^3}-4\frac{\partial^3z}{\partial x ^2\partial y}+4\frac{\partial ^3 z}{\partial x \partial y^2}=2sin(3x+2y)$

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$$\frac{\partial ^3z}{\partial x^3}-4\frac{\partial^3z}{\partial x ^2\partial y}+4\frac{\partial ^3 z}{\partial x \partial y^2}=2sin(3x+2y)$$

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Our solution is corect. With free CAS Maxima:

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