/ x\ |-1 + E | lim |-------| x->oo\ tan(x)/
Limit((-1 + E^x)/tan(x), x, oo, dir='-')
/ x\ |-1 + E | lim |-------| x->0+\ tan(x)/
1
= 1.0
/ x\ |-1 + E | lim |-------| x->0-\ tan(x)/
1.0