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$ A = \begin{pmatrix} -2 & 0 \\ 3 & 1 \end{pmatrix}, u(x,y) = \Bigl(-0.060792 \cos(x) + -0.032851 \cos(x)\sin(y) + 0.091189 \cos(y) + 0.049276 \sin(x)\cos(y) + 0.024638 \cos(2x)\cos(y) + -0.016425 \cos(x)\cos(2y) , -0.091189 \cos(x) + -0.049276 \cos(x)\sin(y) + -0.060792 \cos(y) + -0.032851 \sin(x)\cos(y) + -0.016425 \cos(2x)\cos(y) + -0.024638 \cos(x)\cos(2y)\Bigr)$