qb45qck.hlp (Table of Contents; Topic list)
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ATN Function QuickSCREEN
QuickSCREEN      Details      Example      Contents      Index
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ATN - a math function that returns the arctangent of a numeric
      expression (the angle whose tangent is equal to the numeric
      expression)
 
Syntax
  ATN(numeric-expression)
 
See Also  TAN  SIN  COS