txt: ## atan.md
  atan
  
  Combined from primary sources listed below.
  
  # [In Cool](#___top "go to top of document")[§](#(Cool)_routine_atan "direct link")
  
  See primary documentation
  [in context](/type/Cool#routine_atan)
  for **routine atan**.
  
  ```raku
  sub atan(Numeric(Cool))
  method atan()
  ```
  
  Coerces the invocant (or in sub form, the argument) to [`Numeric`](/type/Numeric), and returns its [arc-tangent](https://en.wikipedia.org/wiki/Inverse_trigonometric_functions) in radians.
  
  ```raku
  say atan(3);                # OUTPUT: «1.24904577239825␤»
  say 3.atan;                 # OUTPUT: «1.24904577239825␤»
  ```
  