ATAN(3) BSD Programmer's Manual ATAN(3)NAME
atan, atanf - arc tangent function of one variable
LIBRARY
libm
SYNOPSIS
#include <math.h>
double
atan(double x);
float
atanf(float x);
DESCRIPTION
The atan() and atanf() functions compute the principal value of the arc
tangent of x in the range [-pi/2, +pi/2].
SEE ALSOacos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
tan(3), tanh(3)STANDARDS
The atan() functions conforms to ANSI X3.159-1989 ("ANSI C").
MirOS BSD #10-current May 2, 1991 1