Rational Developer for System z
Enterprise COBOL for z/OS, Version 4.1, Language Reference


ATAN

The ATAN function returns a numeric value in radians that approximates the arctangent of the argument specified.

The function type is numeric.

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Format

>>-FUNCTION ATAN--(--argument-1--)-----------------------------><

argument-1
Must be class numeric.

The returned value is the approximation of the arctangent of argument-1 and is greater than -Pi/2 and less than +Pi/2.


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