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Let z 0 be a root of the quadratic equation, x 2 + x + 1 = 0. If z = 3 + 6i 81 0 z – 3i 93 0 z , then arg z is equal to :

1. 6 π
2. 3 π
3. 0
4. 4 π

Correct answer: 4 π

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