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; the process of elimination will help with the ones that are not obvious.
1. f(x,y) = sin(y)
2. f(x,y) = 1/(1 + x^2 + y^2)
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) = (x^2 - y^2)^2
7. f(x,y) = 3 - x^2 - y^2