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Using standard formulae, expand each of the following:
(i) (a + 2b + 3c)2
(ii) (3x + 5y - 2z)2
(iii) (2x - 3y + 7z)2
(i) (6 - 2y + 4z)2
(ii) (4x - 3y + z)2
(iii) (7 - 2x - 3y)2