/pi*x\ lim tan|----| x->oo \ 2 /
/pi*x\ lim tan|----| x->1+ \ 2 /
-oo
= -96.1261180609284
/pi*x\ lim tan|----| x->1- \ 2 /
oo
= 96.1261180609284
<-oo, oo>
-96.1261180609284