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atan(3) - atan, atanf, atanl, atan, atanf, atanl - arc tangent function - man 3 atan

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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(1,8) 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.  The float and long double variants
       are C99 requirements.

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



                                  2002-07-27                           ATAN(3)

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