(đđđ â đ^ đ + đ)đ đ + (đđ^đ â đđđ + đđ)đ đ = đ
(2xy-y2+y)dx +(3x2 +4xy+3x)dy=0
M(x, y)=2xy - y2 +y;
N(x, y)=3x2 + 4xy + 3x;
test for I(x, y)=C
dM/dy =2x-2y ....(i)
=dN/dx=3.[2 x(2-1) ] -4y= 6x-4y ...(ii)
since (i) is not equal to (ii) equation is not exact
hence I(x, y)=C does not exist.
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