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Let a= cos((2pi)/7)+i sin((2pi)/7), A=a+...

Let `a= cos((2pi)/7)+i sin((2pi)/7), A=a+a^2+a^4 and B=a^3+a^5+a^6, ` then A and B 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) none of these

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