/ 2\ |1 + x | lim |------| x->-1+| 3| \1 + x /
Limit((1 + x^2)/(1 + x^3), x, -1)
oo
= 100.667407396506
/ 2\ |1 + x | lim |------| x->-1-| 3| \1 + x /
-oo
= -100.667397650203
100.667407396506