Factories: (a+b) (c+d) - a² + b²
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(a+b)(c+d) - a² + b²
ac + ad + bc + bd - a² + b²
ac + bc + ad + bd - a² + b²
c(a+b) + d(a+b) + b² - a²
c(a+b) + d(a+b) - (b+a)(b-a)
(a+b)(c + d -(b - a)
(a + b)(c + d + a - b)
(a + b)(a - b + c + d)
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