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If alphaa n dbeta,alphaa n dgamma,alphaa...

If `alphaa n dbeta,alphaa n dgamma,alphaa n ddelta` are the roots of the equations `a x^2+2b x+c=0,2b x^2+c x+a=0a d nc x^2+a x+2b=0,` respectively, where a, b, and c are positive real numbers, then `alpha+alpha^2=` a.`a b c` b. `a+2b+c` c. `-1` d. `0`

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