令t=arctanx,则x=tant
lim(arctanx)/x
=lim t/tant
=lim t·cos t /sin t
=1
一.x---->0时,证明lim(arctanx)/x=1
一.x---->0时,证明lim(arctanx)/x=1
数学人气:340 ℃时间:2019-11-16 15:31:30
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