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If `a , b ,c in Ra n da(a+b)+b(b+c)+c(c+a)=0` then a.`a=b=c=0` b. `a+b+c+=0` c. `(a-b)^2+(b-c)^2+(c-a)^2=0` d. `a^3+b^3+c^3+3a b c=0`

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