ATAN(3) BSD Library Functions Manual ATAN(3)
NAME
atan, atanf -- arc tangent function of one variable
LIBRARY
Math Library (libm, -lm)
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 ALSO
acos(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 C89'').
BSD
May 2, 1991 BSD
