Q$1.(2$ points$)$ Consider the function $f$:$\frac{R^2}{\frac{?}{?}}\{(1,1)\}{R}^2,$ defined by

$f(x,y)$:$=(\frac{(y^2-1)(x^2-1)}{(y-1)(x-1)},e^{xy})$

Write down:

a$)(1$ point$)\underset{(x,y)(0,0)}{lim}f(x,y),$

b$)(1$ point$)\underset{(x,y)(1,1)}{lim}f(x,y).$