求极限,lim x→2 sin(x-2)÷x平方-4

问题描述:

求极限,lim x→2 sin(x-2)÷x平方-4

=lim(x->2)sin(x-2)/(x-2)*lim(x->2)1/(x+2)=1*1/(2+2)=1/4lim(x->2)sin(x-2)/(x-2)不是趋向0的时候才能等于1吗当x->2时,x-2趋于零