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extremum [extrema]▼(mathematics)noun[UK: ekstrˈeməm] [US: ekstrˈeməm]
turning point [turning points]▼((calculus) maximum or minimum)noun[UK: ˈtɜːn.ɪŋ pɔɪnt] [US: ˈtɝːn.ɪŋ ˈpɔɪnt]
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