/ /pi*x\\ lim |log(2 - x)*tan|----|| x->1+\ \ 2 //
Limit(log(2 - x)*tan((pi*x)/2), x, 1)
/ /pi*x\\ lim |log(2 - x)*tan|----|| x->1+\ \ 2 //
2 -- pi
= 0.636619772367581
/ /pi*x\\ lim |log(2 - x)*tan|----|| x->1-\ \ 2 //
2 -- pi
= 0.636619772367581
= 0.636619772367581