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Let alpha and beta be the roots of the ...

Let `alpha` and `beta` be the roots of the quadratic equation `x sin^(2) theta -x (sin theta cos theta + 1) + cos theta =0 (0le thetale 45^(@)) and alpha le beta` . Then`sum_(n=0)^(oo) (alpha^(n)+((-1)^(n))/(beta^(n)))` is to equal to

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