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In the expansion of (2x2 - 8)(x - 4)2; find the value of :
(i) coefficient of x3
(ii) coefficient of x2
(iii) constant term.
If a2 + b2 = 34 and ab = 12; find :
(i) 3(a + b)2 + 5(a - b)2
(ii) 7(a - b)2 - 2(a + b)2