/ 4 \ lim |------| x->3+| 2| \9 - x /
Limit(4/(9 - x^2), x, 3)
-oo
= -100.555678059537
/ 4 \ lim |------| x->3-| 2| \9 - x /
oo
= 100.777900552486
-100.555678059537