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[" 5) "quad " (aMPLE 14"quad " If "x=(5-...

[" 5) "quad " (aMPLE 14"quad " If "x=(5-sqrt(21))/(2)" ,prove that "],[qquad (x^(3)+(1)/(x^(3)))-5(x^(2)+(1)/(x^(2)))+(x+(1)/(x))=0]

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