lim sin(5*x) x->oo
Limit(sin(5*x), x, oo, dir='-')
<-1, 1>
lim sin(5*x) x->0+
0
= -1.57784879884055e-29
lim sin(5*x) x->0-
= 1.57784879884055e-29
-1.57784879884055e-29