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lim((x→0)(1-cos2x)/(x*sinx)
人气:374 ℃ 时间:2020-02-06 03:13:17
解答
lim((x→0)(1-cos2x)/(x*sinx)
=lim((x→0)(1-(1-2(sinx)^2))/(x*sinx)
=lim((x→0)2sinx/x
2
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