Ba a samun kalmar "arccos" a cikin ƙamus a matsayin kalma kaɗai. Duk da haka, a cikin lissafi, "arccos" aiki ne da ke wakiltar aikin cosine. Aikin arccos yana ɗaukar ƙima tsakanin -1 da 1 azaman shigarwa kuma yana dawo da kwana tsakanin 0 da pi (ko 0 da 180 digiri) azaman fitarwa. Wato idan y = arccos(x), sannan x = cos(y), inda x shine cosine na kwana y.
