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arc- + cos
arccos (plural arccoses)
- Abbreviation of arccosine.
![{\displaystyle \arccos \left({1 \over 2\phi }\right)={2\pi \over 5}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4d3fecd9a79d25ca6d9f40551d2cee270961887e)
1973, The Soviet Economy in Regional Perspective, Praeger Publishers, page 3:[…] with the appropriate constraint angles measured in terms of the arccoses and arctans.