arccos

arc- +‎ cos

arccos (plural arccoses)

1. Abbreviation of arccosine.

   ${\displaystyle \arccos \left({1 \over 2\phi }\right)={2\pi \over 5}}$

   • 1973, The Soviet Economy in Regional Perspective, Praeger Publishers, page 3:

     […] with the appropriate constraint angles measured in terms of the arccoses and arctans.

• arcsin
• arctan

• corsac