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x=2^(1/3)-2^(-1/3) then find 2x^3+6x...

`x=2^(1/3)-2^(-1/3)` then find `2x^3+6x`

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`x=2^(1/3)-2^(-1/3)`
`2x^3+6x=2(2^(1/3)-2^(-1/3))^3+6(2^(1/3)-2^(-1/3))`
`=2(2-2^(-1)-3(2^(1/3)-2^(-1/3)))+6(2^(1/3)-2^(-1/3))`
`=4-1-6(2^(1/3)-2^(-1/3))+6(2^(1/3)-2^(-1/3))`
`=3`.
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