求极限lim n^2 (1-cos1/n) n→∞
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求极限limn^2(1-cos1/n)n→∞求极限limn^2(1-cos1/n)n→∞求极限limn^2(1-cos1/n)n→∞用等价无穷小代换:(1-cosx)~x^2/2,x趋于0,则1-co
求极限lim n^2 (1-cos1/n) n→∞
求极限lim n^2 (1-cos1/n) n→∞
求极限lim n^2 (1-cos1/n) n→∞
用等价无穷小代换:
(1-cosx)~x^2/2,x趋于0,
则1-cos1/n~(1/n)^2/2
则原式=limn^2[(1/n)^2/2]
=1/2
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