a)
(a-b)*(a-b-a-b(=2b*(b-a)
b) ab(b-a)-b^2+a^2=(a-b)*(a+b-ab)
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a)
(a-b)*(a-b-a-b(=2b*(b-a)
b) ab(b-a)-b^2+a^2=(a-b)*(a+b-ab)