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Simplify (i) ( 2a+3b +4c) (4a^(2) +9b...

Simplify
(i) ` ( 2a+3b +4c) (4a^(2) +9b^(2) +16c^(2) -6ab -12bc -8ca ) `
(ii) ` ( x-2y+3z ) ( x^(2) +4y ^(2) +9z^(2) +2xy +6yz -3xz ) `

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The correct Answer is:
18 xyz
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