a ^ { 2 } + b ^ { 2 } + c ^ { 2 } ) ( b ^ { 2 } + c ^ { 2 } + d ^ { 2 – InterviewSolution

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