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Expand of the expression : (x+1/x)^6...

Expand of the expression : `(x+1/x)^6`

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=`""^6C_0``(x)^6`+ `""^6C_1``(x)^5``(1/x)` + `""^6C_2``(x)^4``(1/x)^2` + `""^6C_3``(x)^3``(1/x)^3` + `""^6C_4``(x)^2``(1/x)^4` + `""^6C_5``(x)^1``(1/x)^5` +`""^6C_0``(x)^0``(1/x)^6`
= `x^6` + `6x^4` + `15x^2` + 20 + `15/(x^2)` + `6/(x^4)` + `1/(x^6)`
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