atanl man page on Scientific

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

NAME
atan, atanf, atanl - arc tangent function

SYNOPSIS
#include <math.h>

double atan(double x);
float atanf(float x);
long double atanl( long double x);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

atanf(), atanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
|| _ISOC99_SOURCE; or cc -std=c99

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

RETURN VALUE
On  success, these functions return the principal value of the arc tan‐
gent of x in radians; the return value is in the range [-pi/2, pi/2].

If x is a NaN, a NaN is returned.

If x is +0 (-0), +0 (-0) is returned.

If x  is	 positive  infinity  (negative	infinity),  +pi/2  (-pi/2)  is
returned.

ERRORS
No errors occur.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
4.3BSD, C89.

acos(3), asin(3), atan2(3), carg(3), catan(3), cos(3), sin(3), tan(3)

COLOPHON
This page is part of release 3.22 of the Linux  man-pages  project.   A
description  of	the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.

2008-12-02			       ATAN(3)
```
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