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If alpha and beta are the roots of x^2-2...

If `alpha` and `beta` are the roots of `x^2-2x+4=0` , then `alpha^n+beta^n` is equal to (a) `2^ndotcos((npi)/3)` (b) `2^ndotcos(((n-1)pi)/3)` (c) `2^(n+1)dotcos((npi)/3)` (d) `2^(n+1)dotcos(((n+1)pi)/3)`

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