1. The problem statement, all variables and given/known data Do the following limits exist? State any relevant ideas. a) limit as (x,y) -> (0,0) of (xy)/(x2 - y2) b) limit as (x,y) -> (0,0) of (x2)/(3x4 + y2) c) limit as (x,y) -> (0,0) of sin(2x)/y 3. The attempt at a solution I don't really know where to start; I can't simplify them algebraically, how else can I determine the limit?