lim x趋近于无穷大 sin3次方x分之tanx-sinx的极限
人气：267 ℃ 时间：2019-11-01 14:11:11
解答
你确定是x趋于无穷么?应该是趋于0吧
注意tanx-sinx=tanx*(1-cosx)
在x趋于0的时候,sinx和tanx等价于x,而1-cosx等价于0.5x^2
所以
原极限
=lim(x趋于0) x^3 / (x* 0.5x^2)
=2
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