ATAN(3) Linux Programmer's Manual ATAN(3)

NAME

atan - arc tangent function

SYNOPSIS

#include <math.h> double atan(double x);

DESCRIPTION

The atan() function calculates the arc tangent of x; that is the value whose tangent is x.

RETURN VALUE

The atan() 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

SEE ALSO

acos, asin, atan2, cos, sin, tan,




































                           June 8, 1993                         1




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