/ 4 3 \ | x - x | lim |----------| x->0+| 3 | \x *(1 + x)/
Limit((x^4 - x^3)/((x^3*(1 + x))), x, 0)
= -1
-1
/ 4 3 \ | x - x | lim |----------| x->0-| 3 | \x *(1 + x)/
-1.0