1.

Ifalpha, beta are the roots of x^(2)-2x+4 = 0and for any n in N, a^(n) +B^(n) = k cos""(npi)/(3) then k=

Answer»

`2^(N)`
`2^(n+1)`
`2^(n)-1`
`2^(n)+1`

ANSWER :B


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