/ 2 4\ lim \1 - x + 2*x + 3*x / x->-2+
Limit(1 - x + 2*x^2 + 3*x^4, x, -2)
59
= 59.0
/ 2 4\ lim \1 - x + 2*x + 3*x / x->-2-
59.0