/ _______ 2 \ lim |\/ 4 + x - ------| x->0+\ -1 + x/
Limit(sqrt(4 + x) - 2/(-1 + x), x, 0)
4
= 4
/ _______ 2 \ lim |\/ 4 + x - ------| x->0-\ -1 + x/
4.0