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[" If "x=sqrt(5)+2," then prove that "x^...

[" If "x=sqrt(5)+2," then prove that "x^(2)+1/x^(2)=18" ."],[" Factorize "27x^(3)+y^(3)+z^(3)-9xyz" .Or "2y^(3)+y^(2)-2y]

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