Mathematics, 14.02.2021 01:10, nhdhdj

Prove that if x is an positive real number such that x + x^-1 is an integer, then x^3 + x^-3 is an integer as well.

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Prove that if x is an positive real number such that x + x^-1 is an integer, then x^3 + x^-3 is an i...