The complex number $z = re^{i \theta}$ satisfies
\[\left| 2z + \frac{1}{z} \right| = 1.\]Find the minimum value of $\sin^2 \theta.$
Question:
The complex number $z = re^{i \theta}$ satisfies
\[\left| 2z + \frac{1}{z} \right| = 1.\]Find the minimum value of $\sin^2 \theta.$
Answer:
Let's think step by step.

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\frac{7}{8}
The complex number $z = re^{i \theta}$ satisfies
\[\left| 2z + \frac{1}{z} \right| = 1.\]Find the minimum value of $\sin^2 \theta.$
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