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if x^(3) =1,prove : |{:(a,b,c),(b,c,a)...

`if x^(3) =1,prove : |{:(a,b,c),(b,c,a),(c,a,b):}|=(a+bx+cx^2)|{:(1,b,c),(x^2,c,a),(x,a,b):}|`

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`(a+bx+cx^2)|{:(1,b,c),(x^2,c,a),(x,a,b):}|`
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