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-a³+b³
-a³-b³
-a³+b³ =b^3-a^3= (b-a)(b^2+ab+a^2)
-a³-b³ =-(a^3+b^3)=-(b+a)(b^2-ab+a^2)
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-a³+b³ =b^3-a^3= (b-a)(b^2+ab+a^2)
-a³-b³ =-(a^3+b^3)=-(b+a)(b^2-ab+a^2)