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(a+b)2 = a2 + b2 + 2ab.
(a-b)2 = a2 + b2 – 2ab.
(a+b) (a-b) = a2 – b2.
(x + a)(x + b) = x2 + (a + b)x + ab.
(x + a)(x – b) = x2 + (a – b)x – ab.
(a + b)3 = a3 + b3 + 3ab(a + b)
(a – b)3 = a3 – b3 – 3ab(a – b)
(x – a)(x + b) = x2 + (b – a)x – ab
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