设函数f(x)=(x^2-1)/(x-1),当x的变化趋势( )f(x)为无穷小

问题描述:

设函数f(x)=(x^2-1)/(x-1),当x的变化趋势( )f(x)为无穷小
求原因

设函数f(x)=(x^2-1)/(x-1),当x的变化趋势( )f(x)为无穷小
f(x)=(x-1)(x+1)/(x-1)
当x→-1时,f(x)为无穷小