Kalmar "Arcctosine" tana nufin aikin lissafi wanda ke yin lissafin ƙwayar cuta ta ƙimar da aka bayar. A takaice dai, kusurwa ce wadda take da itacen ku daidai yake da ƙimar da aka bayar. Sakamakon aikin ArcccoSe ana bayyana shi ne a cikin Radio kuma ya ta'allaka a cikin kewayon [0, π]. ARCCOS "ko" Achcos "a cikin lamuran lissafi. Yana da bakin ciki na aikin cosine kuma an ayyana shi kamar haka: Akan aikin Arccoss Files na lissafi da kimiyya, kamar squigonometry, calculus, da kimiyyar lissafi, don magance matsalolin da suka danganci kusurwoyi da nesa.