IF
x + 1/x = 623
then find
x^{4} + 1/ x^{4}
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x + 1/x = 623
(x + 1/x)² = 623²
x² + 1/x² + 2 = 388129
x² + 1/x² = 388127
(x² + 1/x)² = 388127²
x⁴ + 1/x⁴ + 2 = 150642568129
x⁴ + 1/x⁴ = 150642568127
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