ATAN(3) BSD Library Functions Manual ATAN(3)
NAME
atan -- arc tangent function of one variable
SYNOPSIS
#include <math.h>
double
atan(double x);
DESCRIPTION
The atan() function computes the principal value of the arc tangent of x in the range [-pi/2, +pi/2].
SPECIAL VALUES
atan(+-0) returns +-0.
atan(+-infinity) returns +-pi/2
SEE ALSO
acos(3), asin(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3), tan(3), tanh(3), math(3), matherr(3) The atan() function conforms to ISO/IEC
9899:1999(E).
BSD
November 18, 2002 BSD
