arctan

== English == === Alternative forms === arctg === Etymology === From arc- +‎ tan. === Noun === arctan (plural arctans) Abbreviation of arctangent. tan ⁡ ( arctan ⁡ 2 2 ) = 1 ϕ {\displaystyle \tan \left({\arctan 2 \over 2}\right)={1 \over \phi }} === See also === arcsin arccos === Anagrams === cantar