/ 4 \ lim |----------| x->0+| ________| \\/ -1 + x /
Limit(4/sqrt(-1 + x), x, 0)
-4*I
= (0.0 - 4.0j)
/ 4 \ lim |----------| x->0-| ________| \\/ -1 + x /
(0.0 - 4.0j)