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

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

A

1

B

`(-1-isqrt3)/(2)`

C

`(-1+isqrt3)/(2)`

D

`-1`

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The correct Answer is:
D
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