/ 2 x\ lim |-1 + x - -| x->oo\ 2/
Limit(-1 + x^2 - x/2, x, oo, dir='-')
-1/2
/ 2 x\ lim |-1 + x - -| x->-1+\ 2/
1/2
= 0.5
/ 2 x\ lim |-1 + x - -| x->-1-\ 2/
0.5