/ 1 1 \ lim |----- - ---| x->0+\4 + x 4*x/
Limit(1/(4 + x) - 1/(4*x), x, 0)
-oo
= -37.5004132231405
/ 1 1 \ lim |----- - ---| x->0-\4 + x 4*x/
oo
= 38.0004145936982
-37.5004132231405