求lim(x→0)[(x-sinx)÷(x+sinx)]的极限

问题描述:

求lim(x→0)[(x-sinx)÷(x+sinx)]的极限
给点解题步骤谢了.

0……对分子分母分别求导有(1-cosX)/(1+cosX)把X等于零代入可得值为0