Man pages matching name acos in section 3:

acos.3.de	debian 10 / manpages-de-dev
acos.3.en	debian 10 / manpages-dev
acos.3.es	debian 10 / manpages-es
acos.3.ja	debian 10 / manpages-ja-dev
acos.3.pl	debian 10 / manpages-pl-dev
acos.3.pt	debian 10 / manpages-pt-dev
acos.3.de	debian 11 / manpages-de-dev
acos.3.en	debian 11 / manpages-dev
acos.3.fr	debian 11 / manpages-fr-dev
acos.3.ja	debian 11 / manpages-ja-dev
acos.3.pl	debian 11 / manpages-pl-dev
acos.3.pt	debian 11 / manpages-pt-dev
acos.3.cs	debian 12 / manpages-cs-dev
acos.3.de	debian 12 / manpages-de-dev
acos.3.en	debian 12 / manpages-dev
acos.3.es	debian 12 / manpages-es-dev
acos.3.fr	debian 12 / manpages-fr-dev
acos.3.ja	debian 12 / manpages-ja-dev
acos.3.pl	debian 12 / manpages-pl-dev
acos.3.pt_BR	debian 12 / manpages-pt-br-dev
acos.3.ru	debian 12 / manpages-ru-dev