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lim(x→0)(1-cosx)/(xsinx)=?
人气:388 ℃ 时间:2020-01-29 19:39:36
解答
lim(x→0)(1-cosx)/(xsinx)
=lim(x→0)(1-(1-2(sin x/2)^2)/(xsinx)
=(1-(1-2*x^2*(1/2)^2))/x^2
=1/2
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