(a-b)(a-b2) (a-b^)(a-b6)
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=(a-b) (a-2b) (a-b^) (a-6b)
=a(a-2b)-b(a-2b) a(a-6b)-b(a-6b)
=a²-2ab-ab+2b² a²-6ab-ab+6b²
=a⁴+12a²b²+a²b2+12b⁴.
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