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What is the value of $ a^2 + b^2 +c^2 - 2ab =2bc +2 ca $ ? |
(a - b - c)2 (a + b - c)2 (a + b + c)2 (a - b + c)2 |
(a - b + c)2 |
We know that, (a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca (a - b + c)2 = a2 + b2 + c2 - 2ab - 2bc + 2ca |
