atanf man page on CentOS

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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);

       Link with -lm.

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
       SVr4,  POSIX.1-2001,  4.3BSD,  C89.  The float and long double variants
       are C99 requirements.

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

				  2002-07-27			       ATAN(3)
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