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lim cos2x/(sinx-cosx) x→π/4 求函数的极限
人气:479 ℃ 时间:2019-08-20 20:11:30
解答
lim cos2x/(sinx-cosx)
=lim (cosx+sinx)(cosx-sinx)/(sinx-cosx)
=lim- (cosx+sinx)
=-√2
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