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(-a-b)²=a²+2ab+b²
(-a+b)²=a²-2ab+b²
(a-b)(b+a)a²-b²
(a+b)(b-a)=b²-a²
(b-a)(a-b)=-a²+2ab-b²
(3a- 1/2)²=9a²-1/4