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(a−b)(a+b)=a2−b2{\displaystyle (a-b)(a+b)=a^{2}-b^{2}}
(a+b)2=a2+2ab+b2{\displaystyle (a+b)^{2}=a^{2}+2ab+b^{2}}
(a−b)2=a2−2ab+b2{\displaystyle (a-b)^{2}=a^{2}-2ab+b^{2}}