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19. Let k be a real number. (a) Express (ex te kin 3 i in ascending powers of x as far as the term in

19. Let k be a real number. (a) Express (ex te kin 3 i in ascending powers of x as far as the term in x2. (b) If the coefficient of x2 in the result of (a) is 3, find all possible values of k

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