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(x³y²-x²y³)(a-b)
ab+bc+ad+cd
(ab+bc)+(ad+cd)
b(a+c)+d(a+c)
(b+d)(a+c)
36x²-1
(6x+1)(6x-1)
27x³+1
(3x+1)(9x²₊3x₊1)