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If alpha, beta are the roots of x^2 + x ...

If `alpha, beta` are the roots of `x^2 + x +1 = 0 ` and `s_n=alpha^n+beta^n` then `|[3,1+s_1,1+s_2],[1+s_1,1+s_2,1+s_3],[1+s_2,1+s_3,1+s_4]|`

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