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x^3+o(x^3)=x^3(1+o(1)) 從而(x^3(1+o(1)))^2/3=x^2(1+o(1))^2/3=x^2(1+2/3*o(1))=x^2(1+o(1))=x^2+o(x^2). 這裡省略了係數1/6,可自行加上.
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