4X (a-b) + (B Λ 2-A Λ 2) factorization

4X (a-b) + (B Λ 2-A Λ 2) factorization

4x(a-b)+(b∧2-a∧2)
=4x(a-b)-(a+b)(a-b)
=(4a-a-b)(a-b)
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