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.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
160
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.
train