当x趋于0时,a为何值,1-(1-ax^2)^(1/2)与x^2等价无穷小?

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当x趋于0时,a为何值,1-(1-ax^2)^(1/2)与x^2等价无穷小?
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当x趋于0时,a为何值,1-(1-ax^2)^(1/2)与x^2等价无穷小?
当x趋于0时,a为何值,1-(1-ax^2)^(1/2)与x^2等价无穷小?

当x趋于0时,a为何值,1-(1-ax^2)^(1/2)与x^2等价无穷小?