> Example of a Conservative Vector Field


> with(plots):
> P:=y^2+3*y*exp(3*x);

                              2
                        P := y  + 3 y exp(3 x)

> Q:=1+2*x*y+exp(3*x);

                      Q := 1 + 2 x y + exp(3 x)

> fieldplot([P,Q],x=-1..0,y=-2..2,color=blue,grid=[10,10]);

> fieldplot([P,Q],x=0..1,y=-2..2,color=blue,grid=[10,10]);

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