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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH carg 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-carg, cargf, cargl \- calculate the complex argument
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <complex.h>
-.PP
-.BI "double carg(double complex " z ");"
-.BI "float cargf(float complex " z ");"
-.BI "long double cargl(long double complex " z ");"
-.fi
-.SH DESCRIPTION
-These functions calculate the complex argument (also called phase angle) of
-.IR z ,
-with a branch cut along the negative real axis.
-.PP
-A complex number can be described by two real coordinates.
-One may use rectangular coordinates and gets
-.PP
-.in +4n
-.EX
-z = x + I * y
-.EE
-.in
-.PP
-where
-.I x\~=\~creal(z)
-and
-.IR y\~=\~cimag(z) .
-.PP
-Or one may use polar coordinates and gets
-.PP
-.in +4n
-.EX
-z = r * cexp(I * a)
-.EE
-.in
-.PP
-where
-.I r\~=\~cabs(z)
-is the "radius", the "modulus", the absolute value of
-.IR z ,
-and
-.I a\~=\~carg(z)
-is the "phase angle", the argument of
-.IR z .
-.PP
-One has:
-.PP
-.in +4n
-.EX
-tan(carg(z)) = cimag(z) / creal(z)
-.EE
-.in
-.SH RETURN VALUE
-The return value is in the range of [\-pi,pi].
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.BR carg (),
-.BR cargf (),
-.BR cargl ()
-T} Thread safety MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.SH SEE ALSO
-.BR cabs (3),
-.BR complex (7)