(ii) 3x2 - y2 + 2xy - z7, x2 + 2y2 + 4xy – 32", -21
(iii) a² + b2 + c2 - 3abc, 2a2-362 +262 + abc, 3a+ 362 - c2 +4abc
(iv) + m2 - 12 - Imn, 312 + 2m2 + 3n2 + 4lmn, - 22 + 2m- n+ 2lmn
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gukfyidjchkfu ffhfh uicu gohfukjgfjr tougjm
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