how to solve 3asquare_bsquare_csquare+2ab_2bc+2ca
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3a^2 - b^2 -c^2+2ab +2bc+2ca ........
it is a identity....
a2+b2+c2+2ab +2bc +2ca
(3a +b+c)^2
it is a identity....
a2+b2+c2+2ab +2bc +2ca
(3a +b+c)^2
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