2 - x /1 + x\ lim |-----| x->0+\1 - x/
Limit(((1 + x)/(1 - x))^(2/x), x, 0)
4 e
= 54.5981500331442
2 - x /1 + x\ lim |-----| x->0-\1 - x/
54.5981500331442