Find the product using sutiable identity : (2x - y + 3z) (4x² + y² + 9z² + 2xy + 3yz - 6zx)
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identity (a+b+c)^2 + ( a^2 + b^2 +c^2 +2ab +2bc +2ac)= 3abc
= 3×2x×1y×3z
= 18xyz
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