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URGENT GIVE ANSWER PLZZZ

Answer»

Just u have to TAKE 2A SQUARE as a^2+a^2 then
a^2+a^2+b^2+B^2+c^2+c^2-2ab-2bc-2ca
=then it is the identity of (a-b)^2 so it is
(a-b)^2+(b-c)^2+(c-a)^2



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