a1(x,y):=exp(x/2)*exp(y)/2;

NiM+LUkjYTFHNiI2JEkieEdGJkkieUdGJiwkKiYtSSRleHBHNiRJKnByb3RlY3RlZEdGL0koX3N5c2xpYkdGJjYjLCRGKCMiIiIiIiNGNC1GLTYjRilGNEYz

b1(x,y):=0.7/(x*x*y*y+0.5);

NiM+LUkjYjFHNiI2JEkieEdGJkkieUdGJiwkKiQsJiomRigiIiNGKUYuIiIiJCIiJiEiIkYvRjIkIiIoRjI=

c1(x,y):=(4-exp(x)-exp(y/2))*2;

NiM+LUkjYzFHNiI2JEkieEdGJkkieUdGJiwoIiIpIiIiLUkkZXhwRzYkSSpwcm90ZWN0ZWRHRjBJKF9zeXNsaWJHRiY2I0YoISIjLUYuNiMsJEYpI0YsIiIjRjM=

d1(x,y):=x*x+y;

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e1(x,y):=x*y*y;

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f1(x,y):=3*x+2*y;

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u(x,y):=x*x*x+2*y*y*y+3*x*x*y+4*x*y*y+5*x*y+6*x+7*y+8;

NiM+LUkidUc2IjYkSSJ4R0YmSSJ5R0YmLDIqJEYoIiIkIiIiKiRGKUYsIiIjKiZGKEYvRilGLUYsKiZGKEYtRilGLyIiJSomRihGLUYpRi0iIiZGKCIiJ0YpIiIoIiIpRi0=

ux(x,y):=diff(u(x,y),x);

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uy(x,y):=diff(u(x,y),y);

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uxy(x,y):=diff(ux(x,y),y);

NiM+LUkkdXh5RzYiNiRJInhHRiZJInlHRiYsKEYoIiInRikiIikiIiYiIiI=

uxx(x,y):=diff(ux(x,y),x);

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uyy(x,y):=diff(uy(x,y),y);

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c(x,y):=a1(x,y)*uxx(x,y)+b1(x,y)*uxy(x,y)+c1(x,y)*uyy(x,y)+d1(x,y)*ux(x,y)+e1(x,y)*uy(x,y)+f1(x,y)*u(x,y);

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