[tex] \lim_{x \to 2} \frac{x^2-4}{x^2-4x-4} = \frac{2^2-4}{2^2-4*2-4}= \frac{0}{-8} =0\\
Obs. \lim_{x \to 2,x\ \textgreater \ 2} \frac{x^2-4}{x^2-4x+4} =\lim_{x \to 2,x\ \textgreater \ 2} \frac{(x-2)(x+2)}{(x-2)^2} =\\
=\lim_{x \to 2,x\ \textgreater \ 2} \frac{(x+2)}{(x-2)} =+\infty[/tex]
