Match the functions with the graphs labeled A - G. 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). Just take your time; process of elimination will help with ones that are not obvious.

1. $f(x,y) = (x^2 - y^2)^2$
2. $f(x,y) = \sin(y)$
3. $f(x,y) = 1/(1 + x^2 + y^2)$
4. $f(x,y) = \sin(x)\sin(y)e^{-x^2 - y^2}$
5. $f(x,y) = 3 - x^2 - y^2$
6. $f(x,y) = \cos(x^2 + y^2)/(1 + x^2 + y^2)$
7. $f(x,y) = (x - y)^2$

A	B	C	D	E	F	G