1. I know both dne but how can i prove it? I am not getting any solid answers? help please!
(x,y) to (0,0)
1. ((x^2)y+x(y^2))/((x^2)-(y^2))
2. (x+y)/((x^2)+y+(y^2))
2. 1. Simplified down to xy/(x-y)
2. Simplified down to x/(x^2+y^2+y) + 1/((y+1)+x^2)