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lim(x→0)(1-cos2x)/(xsinx)的极限
人气:424 ℃ 时间:2020-02-04 06:41:08
解答
lim(x→0)(1-cos2x)/(xsinx)
=lim(x→0)(2(sinx)^2)/(xsinx)
=lim(x→0)(2sinx)/(x)
=2
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