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ATAN(3)			   Linux Programmer's Manual		       ATAN(3)

NAME
       atan - arc tangent function

SYNOPSIS
       #include	<math.h>

       double atan(double x);

DESCRIPTION
       The  atan() function calculates the arc tangent of x; that is the value
       whose tangent is	x.

RETURN VALUE
       The atan() function returns the arc tangent in radians and the value is
       mathematically defined to be between -PI/2 and PI/2 (inclusive).

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       acos(3),	asin(3), atan2(3), cos(3), sin(3), tan(3)

				  1993-06-08			       ATAN(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | SEE ALSO

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