lim sin(4*x) x->oo
Limit(sin(4*x), x, oo, dir='-')
<-1, 1>
lim sin(4*x) x->0+
0
= 2.57218933233653e-30
lim sin(4*x) x->0-
= -2.57218933233653e-30
2.57218933233653e-30