a ^ { 2 } + b ^ { 2 } + c ^ { 2 } - 2 a b + 2 b c - 2 c a = ( a - b - – InterviewSolution

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1.	a ^ { 2 } + b ^ { 2 } + c ^ { 2 } - 2 a b + 2 b c - 2 c a = ( a - b - c ) ^ { 2 }
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