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