Question Number 133028 by mohammad17 last updated on 18/Feb/21
Answered by Dwaipayan Shikari last updated on 18/Feb/21
$$\underset{\left({x},{y}\right)\rightarrow\left(\mathrm{1},\mathrm{1}\right)} {\mathrm{lim}}\frac{{x}^{\mathrm{2}} −{y}^{\mathrm{2}} }{{x}−{y}}={x}+{y}=\mathrm{2} \\ $$