( a + b ) ^ { 3 } + ( b + c ) ^ { 3 } + ( c + a ) ^ { 3 } - 3 ( a + b – InterviewSolution

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1.	( a + b ) ^ { 3 } + ( b + c ) ^ { 3 } + ( c + a ) ^ { 3 } - 3 ( a + b ) ( b + c ) ( c + a ) = 2 ( a ^ { 3 } + b ^ { 3 } + c ^ { 3 } - 3 a b c )
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