答：
lim(x→1) (x^2-1) / lnx
=lim(x→1) (x-1)(x+1) / lnx
=lim(x→1) (1+1)*(x-1) / lnx
=lim(x→1) 2(x-1) / lnx
=lim(x→1) 2 / (1/x)
=2