/ 4 1 \ lim |x - ------| x->1+| 3| \ 1 - x /
Limit(x^4 - 1/(1 - x^3), x, 1)
oo
= 51.0282211843184
/ 4 1 \ lim |x - ------| x->1-| 3| \ 1 - x /
-oo
= -49.6943713005928
51.0282211843184