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[" A.If "alpha" and "beta" are the roots...

[" A.If "alpha" and "beta" are the roots of "x^(2)-2x+4=0" then "alpha^(n)+beta^(n)" is equ "],[[" (A) "2^(n)*cos(n pi)/(3)," (B) "2^(n)*cos((n+1)pi)/(3)," (c) "2^(n+1)*cos]]

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