Answers

2016-04-07T00:06:37+05:30
2016-04-07T07:49:30+05:30
[a-b-c]² = a² + (-b)² + (-c)² + 2[ a(-b) + (-b)(-c) + (-c)a ]
             = a² + b² + c² - 2ab + 2bc - 2ca 
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