If alpha and beta are the roots of the e...

If `alpha` and `beta` are the roots of the equations `x^2-x+1 = 0`, then `(alpha)^2+(beta)^2` is

A

`A.frac{-1+isqrt3}{2}`

B

`B.-1`

C

`C.1`

D

`D.frac{-1-isqrt3}{2}`

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