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1-cosx的等价无穷小为0.5x怎么证明
人气:156 ℃ 时间:2020-05-08 05:37:23
解答
x→0时(1-cosx)/(x^2/2)
=2[sin(x/2)]^2/(x^2/2)
→1,
∴1-cosx与x^2/2是等价无穷小.
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