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prove that , |{:(2ab,a^2,b^2),(a^2,b^2,2...

prove that , `|{:(2ab,a^2,b^2),(a^2,b^2,2ab),(b^2,2ab,a^2):}|=-(a^3+b^3)^2`

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`=-(a^3+b^3)^2`
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