arctan(1/x^2)求x趋近于0的极限怎么求?
人气：433 ℃ 时间：2020-07-03 13:41:29
解答
答：
设1/x^2=t
lim(x→0) arctan(1/x^2)
=lim(t→+∞) arctan(t)
=π/2
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