Word Count : 117

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[ (D^2- D D' -2D)z=\sin(3x+4y)+e^{2x+y} ] where (D=\frac{\partial}{\partial x},;D'=\frac{\partial}{\partial y}). The complementary function is obtained from [ D^2- D D' -2D=0 ;;\Rightarrow;; D(D-D'-2)=0. _________ __________ _______ ________ ______ _________ __________ _______ _____ _____ ________.
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