若lim x趋向0,(xcosα-sinα)/2x^3拆成(xcosα/2x^3)-(sinα/2x^3)那分子能用无穷小量代换了吗?按理说加减不能替换,貌似拆成这样也不能替换,困扰我好久了
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lim(x趋向0)xcos(1/x)怎么计算
若lim x趋向0,(xcosα-sinα)/2x^3拆成(xcosα/2x^3)-(sinα/2x^3)那分子能用无穷小量代换了吗?按理说加减不能替换,貌似拆成这样也不能替换,困扰我好久了
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