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Let a be a complex number such that |a| = 1. If the az^2 + z + 1 = 0 has a pure imaginary root, then tan(arg a) = ?a)(sqrt(5) - 1)/2b)(sqrt(5) + 1)/2c)sqrt((sqrt(5) - 1)/2)d)sqrt((sqrt(5) + 1)/2)
i think it should be op. (d)
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