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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

Let P(x) = x^6 - x^5 - x^3 - x^2 - x and , , , are the roots of the equation x^4 - x^3 - x^2 - 1 = 0 , then P( ) + P( ) + P( ) + P( ) =

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6

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