If `a=cos (2pi)/7 + i sin (2pi)/7` `,alpha =a+a^2+a^4`, `beta =a^3+a^5+a^6` then `alpha, beta` are the roots of the equation

If `a=cos (2pi)/7 + i sin (2pi)/7` `,alpha =a+a^2+a^4`, `beta =a^3+a^5+a^6` then `alpha, beta` are the roots of the equation
A. `x^(2) - x + 2 = 0`
B. `x^(2) + x - 2 = 0`
C. `x^(2) - x - 2 = 0`
D. `x^(2) + x + 2 = 0`

If `a=cos (2pi)/7 + i sin (2pi)/7` `,alpha =a+a^2+a^4`, `beta =a^3+a^5+a^6` then `alpha, beta` are the roots of the equation

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