The equation $z^6+z^3+1=0$ has one complex root with argument $\theta$ between $90^\circ$ and $180^\circ$ in the complex plane. Determine $\theta,$ in degrees.
Question:
The equation $z^6+z^3+1=0$ has one complex root with argument $\theta$ between $90^\circ$ and $180^\circ$ in the complex plane. Determine $\theta,$ in degrees.
Answer:
Let's think step by step.

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The equation $z^6+z^3+1=0$ has one complex root with argument $\theta$ between $90^\circ$ and $180^\circ$ in the complex plane. Determine $\theta,$ in degrees.
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