1) Determine:

lim

(x,y)-->(-1,1)__________(x^2 - y^2)/(xy + y^2 + x + y)

2) Show that it doesnt exist.

lim

(x,y)--> (0,0)____________(2xy)/(x^2 + 2y^2)

If you plug in the numbers for (1) you get 0/0 same with (2), which doesnt seem right at all. Im pretty sure there is suppose to be atleast a few lines of working.