If $\cos \theta = \frac{2}{3},$ then find $\cos 2 \theta.$
Question:
If $\cos \theta = \frac{2}{3},$ then find $\cos 2 \theta.$
Answer:
Let's think step by step.

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-\frac{1}{9}
If $\cos \theta = \frac{2}{3},$ then find $\cos 2 \theta.$
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