# Another multi-v limit

1. Oct 1, 2009

### Wesleytf

1. The problem statement, all variables and given/known data
$$\frac{lim}{(x,y)->(1,-1)}$$ $$\frac{1-xy}{1+xy}$$

2. Relevant equations
none

3. The attempt at a solution
I know from the graph this limit doesn't exist, but I tried subbing y=-x, xy=u, y=-1, x=1, and I always come up with the limit going to infinity. Not sure what I'm doing wrong, but I feel like I'm close.
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Oct 1, 2009

### Dick

I'm not sure what your question is. Isn't 'going to infinity' one way that a 'limit doesn't exist'?