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[" 4."2.21" Let "alpha" and "beta" be th...

[" 4."2.21" Let "alpha" and "beta" be the roots of equation "x^(2)-6x-2=0." If "a_(n)=alpha^(n)-beta^(n)" ,for "n>=1" ,then the value of "],[(a_(10)-2a_(8))/(2a_(9))" is equal to "]

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