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ATAN2(3) Linux Programmer's Manual ATAN2(3)

NAME

atan2 - arc tangent function of two variables

SYNOPSIS

#include <math.h> double atan2(double y, double x);

DESCRIPTION

The atan2() function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result.

RETURN VALUE

The atan2() function returns the result in radians, which is between -PI and PI (inclusive).

CONFORMING TO

SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO

acos, asin, atan, cos, sin, tan,



































                           June 8, 1993                         1




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