\frac{2 \pi}{3}
Question:
Compute $\arccos \left( -\frac{1}{2} \right).$  Express your answer in radians.
Answer:
Let's think step by step.

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\frac{2 \pi}{3}
Compute $\arccos \left( -\frac{1}{2} \right).$  Express your answer in radians.
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