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  1. Spreadsheet Function: ATN()
  2. Synopsis:
  3.  
  4. @ATN(expression)
  5.  
  6. Description:
  7.  
  8. This   function   returns   the  arctangent  of  the
  9. expression.
  10.  
  11. Note:   Trig functions are all specified in radians.
  12. If  you need to convert between degrees and radians,
  13. the functions, @RAD and @DEG will help.
  14.  
  15. Examples:
  16.  
  17. @ATN(20) would give, 1.52084.
  18. @ATN(-5) would give, -1.3734.
  19. *
  20. Using Functions
  21. Usefunc.help
  22. Maths Operators
  23. operators.help