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x^{13} + 1/x^{13} as a polynomial in y = x + 1/x

Source: 1979 Swedish Mathematical Competition p3

March 26, 2021
algebra

Problem Statement

Express x13+1x13 x^{13} + \frac{1}{x^{13}} as a polynomial in y=x+1xy = x + \frac{1}{x}.