题目
求极限的问题
lim tanx^2/1-cosx(X趋近0)
答案解析
lim tanx^2/1-cosx=lim (sinx^2/cosx^2)/(1-cosx)=lim (sinx^2)/[cosx^2*(1-cosx)]=lim (1-cosx^2)/[cosx^2*(1-cosx)]=lim [(1+cosx)(1-cosx)]/[cosx^2*(1-cosx)]分子分母同时约掉(1-cosx)=lim (1+cosx)/cosx^2=2...
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