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Manpage of ATAN

ATAN

Index
 

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);

 

DESCRIPTION

The fBatan()fP function calculates the arc tangent of fIxfP; that is the value whose tangent is fIxfP.  

RETURN VALUE

The fBatan()fP 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. The float and long double variants are C99 requirements.  

SEE ALSO

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
CONFORMING TO
SEE ALSO