Find the coefficient of x^2 in the following polynomials. (i) (x-4)(x-4) (ii) 1-x^2-x^3+2 x^7 (ii...

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Find the coefficient of x^2 in the following polynomials.
(i) (x-4)(x-4)
(ii) 1-x^2-x^3+2 x^7
(iii) (x+4)(x+4)(x+4)
(iv) (2 x-5)(2 x^2-3 x+1)
(v) (3 x^2+2 x-4)(x^2-3 x-2)

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