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[" 29.If "x+(1)/(x)=7," then "x^(3)-(1)/...

[" 29.If "x+(1)/(x)=7," then "x^(3)-(1)/(x^(3))" is "],[[" (1) "9sqrt(5)," (2) "144sqrt(5)," (3) "135sqrt(5)," (4) "sqrt(5)]]

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