[RESOLVED] How do you get a unique ID from two numbers w/o ordering them?

[realMakc]

(x^2+y^2)+( SIN(ATAN(x/y)) * COS(ATAN(x/y)) )

unfortunately no, it does not depend on how much of full plane you use, as long as there's infinite amount of numbers. take a look at the graph, and especially contour plot of your function below - every curve on contour plot represents a set of (x,y) points that evaluate in the same value.