lim x→1 sin(1-x)2/(x2-1)2等于多少

问题描述:

lim x→1 sin(1-x)2/(x2-1)2等于多少

lim x→1 sin(1-x)2/(x2-1)2
=lim x→1 (1-x)2/(x2-1)2
=lim x→1 1/(x+1)2
=1/4