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> plot3d(f,x=-3..3,y=-3..3);

After this, Maple says it is initializing a plot and then I get a big blank space.

I'm also trying to find the contours, but when I type:

> contourplot(f,x=-3..3,y=-3..3,contours=5);

Maple just gives: contourplot(f,x=-3..3,y=-3..3,contours=5)

How can I fix these two things?