/-sin(x) + tan(x)\ lim |----------------| x->oo| 3 | \ x /
Limit((-sin(x) + tan(x))/x^3, x, oo, dir='-')
/-sin(x) + tan(x)\ lim |----------------| x->0+| 3 | \ x /
1/2
= 0.5
/-sin(x) + tan(x)\ lim |----------------| x->0-| 3 | \ x /
0.5