上面题目是不是有问题?应该是lim(x→0)[( cosx-1) /(sin² x)]这样的话 用洛必达法则,对分子分母分别求导,得lim(x→0)[ cosx-1 /(sin² x)] =lim(x→0)[ -sinx/2sinxcosx]=-1/(2cosx)=-1/2 如果题目没...
lim(x→0)[ cosx-1 /(sin² x)] 等于多少?
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