A/b +b/a = -1, then (a cube - b cube)?
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a/b+b/a= -1⇒a²+b²= -ab
a³-b³=(a-b)(a²+b²+ab)⇒(a-b)(ab-ab)=(a-b)(0)=0
a³-b³=(a-b)(a²+b²+ab)⇒(a-b)(ab-ab)=(a-b)(0)=0
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