/ 4 2 \ lim |x + -- + 3*x4| x->1+| 3 | \ x /
Limit(x^4 + 2/x^3 + 3*x4, x, 1)
3 + 3*x4
/ 4 2 \ lim |x + -- + 3*x4| x->1-| 3 | \ x /