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- (a₊b)(a-b)=a²-b²
- (a₊b)² = a²₊2ab₊b²
-(a-b)²=a²-2ab₊b²
-(a₊b)(a²-ab₊b²)=a³₊b³
-(a-b)(a²₊ab₊b²)=a³-b³