carg man page on Archlinux

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```CARG(3)			   Linux Programmer's Manual		       CARG(3)

NAME
carg, cargf, cargl - calculate the complex argument

SYNOPSIS
#include <complex.h>

double carg(double complex z);
float cargf(float complex z);
long double cargl(long double complex z);

DESCRIPTION
A complex number can be described by two real coordinates.  One may use
rectangular coordinates and gets

z = x + I * y

where x = creal(z) and y = cimag(z).

Or one may use polar coordinates and gets

z = r * cexp(I * a)

where r = cabs(z) is the "radius", the "modulus", the absolute value of
z, and a = carg(z) is the "phase angle", the argument of z.

One has:

tan(carg(z)) = cimag(z) / creal(z)

RETURN VALUE
The return value is the range of [-pi,pi].

VERSIONS
These functions first appeared in glibc in version 2.1.

CONFORMING TO
C99.

cabs(3), complex(7)

COLOPHON
This  page  is  part of release 3.65 of the Linux man-pages project.  A
description of the project, and information about reporting  bugs,  can
be found at http://www.kernel.org/doc/man-pages/.

2008-08-11			       CARG(3)
```
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