(a+b)3 - a3+b3+3ab(a+b), a3 + b3+c3-3abc - (a+b+c)(a2+b2+c2-ab-bc-ca), a3-b3 - (a-b)(a2+ab+b2), (a+b-c)2 - a2+b2+c2+2ab-2bc-2ca, (a-b)2 - a2-2ab+b2, (a+b)2 - a2 +2ab+b2, (a-b)3 - a3+b3-3ab(a+b), a3+ b3 - (a+b)(a2+ab+b2),

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