Question: DEplot issues on maple 17

Consider the differential equation   d/dx y(x)=2*y(x)*(y(x)-4), on the rectangle -1 < x < 1, -2 < y < 7.40 in the xy-plane.

(a) Use DEplot to plot the direction field for the differential equation on the given domain. Assign your answer to my_plot_1.

restart: with(DEtools):
DEexp1:=2*y(x)*(y(x)-4);

DE:=Diff(y(x),x)=DEexp1;


DEplot(DE, y(x), x=-1..1, y=-2..7.4);
Error, (in DEtools/DEplot/CheckDE) derivatives must be given explicitly

 

Thanks for your help!

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