(a+2b+c)(a²+4b²+c²-2ab-2bc-ca) find product
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ANSWER is, a^3+8b^3+c^3-6abc. REASON is by applying the formula
(a+b+c) (a^2+b^2+c^2-ab-bc-ca).
(a+b+c) (a^2+b^2+c^2-ab-bc-ca).
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