Question

极限问题不懂，求解

Answer 1

x->1

x-1->0
sin(x-1) = x-1 +o((x-1))
lim(x->1) sin(x-1)/(x^2-1)
=lim(x->1) (x-1)/(x^2-1)
=lim(x->1) 1/(x+1)
=1/2