设函数f(x)在x=0的某领域内连续,且f(0)=0,lim(x---0) f(x)/(1-cosx) =2 ,问f(x)在x=0处是否可导,求详解

问题描述:

设函数f(x)在x=0的某领域内连续,且f(0)=0,lim(x---0) f(x)/(1-cosx) =2 ,问f(x)在x=0处是否可导,求详解