1.📷 (a+b)²= a²+2ab+b² 2.📷 (a+b)²= (a-b)²+4ab 3.📷 (a-b)²= a²-2ab+b² 4.📷 (a-b)²= (a+b)²-4ab 5.📷 a² + b²= (a+b)²-2ab. 6.📷 a² + b²= (a-b)²+2ab. 7.📷 a²-b²= (a +b)(a -b) 8.📷 2(a²+b²)= (a+b)²+(a-b)² 9.📷 4ab = (a+b)²-(a-b)² 10.📷 ab = {(a+b)/2}²-{(a-b)/2}² 11.📷 (a+b+c)² = a²+b²+c²+2(ab+bc+ca) 12.📷 (a+b)³ = a³+3a²b+3ab²+b³ 13.📷 (a+b)³ = a³+b³+3ab(a+b) …

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