ATAN(3) | FreeBSD Library Functions Manual | ATAN(3) |
NAME
atan, atanf, atanl — arc tangent functions of one variableLIBRARY
Math Library (libm, -lm)SYNOPSIS
#include < math.h> double
atan( double x);
float
atanf( float x);
long double
atanl( long double x);
DESCRIPTION
The atan(), atanf(), and atanl() functions compute the principal value of the arc tangent of x.RETURN VALUES
These functions return the arc tangent in the range [-pi/2, +pi/2] radians.STANDARDS
The atan(), atanf(), and atanl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).July 31, 2008 | FreeBSD |