"arccos" meaning in English

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  "etymology_text": "Etymology tree\nProto-Indo-European *h₂erkʷ-\nProto-Indo-European *h₂erkʷos\nProto-Italic *arkuos\nLatin arcusder.\nEnglish arc-\nEnglish cos\nEnglish arccos\nFrom arc- + cos.",
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          "word": "arccosine"
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          "text": "arccos (1/2ϕ)=2π/5"
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          "ref": "1973, The Soviet Economy in Regional Perspective, Praeger Publishers, page 3:",
          "text": "[…]with the appropriate constraint angles measured in terms of the arccoses and arctans.",
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          "word": "arcsin"
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          "word": "arctan"
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