I'm taking a data mining course in uni, and the professor asked us to prove that $\arccos(\cos(x, y))$ is a metric. I've never seen such a notation, having two numbers inside cosine function. Does anyone have a clue to what does it mean?
2026-03-25 16:01:49.1774454509
Prove that $\arccos(\cos(x, y))$ is a metric
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