How to Find Points of Discontinuity for a 2-Variable Limit in Calculus 3?

[lukasz08]

find the points of discontinuouty

limit as x,y ---> (0,0) of function f(x,y) = 1-((cos(x^2+y^2)/(x^2+y^2))

 

[Pere Callahan]

What have you tried so far? And are you sure that you don't have a typo in your function? As it is, it diverges as (x,y)->(0,0).