Match the functions with their contour plots labeled A - D. Most of these functions appear in the previous problem, so comparing with the graphs there may help. As always, you may click on the thumbnail image to produce a larger image in a new window (sometimes exactly on top of the old one).


1. $f(x,y) = 1/(1 + x^2 + y^2)$
2. $f(x,y) = (x - y)^2$
3. $f(x,y) = (x^2 - y^2)^2$
4. $f(x,y) = 3 - x^2 - y^2$

A	B	C	D