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If a,b,ca,b,ca,b,c are real numbers and a+b+c=0a+b+c=0a+b+c=0 then the value ∑cyca,b,ca(b−c)3\sum_{cyc}^{a,b,c}a(b-c)^{3}cyc∑a,b,ca(b−c)3
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