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-'\" t
-.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.\" and Copyright (C) 2011 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH catan 3 2023-11-01 "Linux man-pages 6.7"
-.SH NAME
-catan, catanf, catanl \- complex arc tangents
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <complex.h>
-.P
-.BI "double complex catan(double complex " z );
-.BI "float complex catanf(float complex " z );
-.BI "long double complex catanl(long double complex " z );
-.fi
-.SH DESCRIPTION
-These functions calculate the complex arc tangent of
-.IR z .
-If \fIy\~=\~catan(z)\fP, then \fIz\~=\~ctan(y)\fP.
-The real part of
-.I y
-is chosen in the interval [\-pi/2, pi/2].
-.P
-One has:
-.P
-.in +4n
-.EX
-catan(z) = (clog(1 + i * z) \- clog(1 \- i * z)) / (2 * i)
-.EE
-.in
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR catan (),
-.BR catanf (),
-.BR catanl ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-C99, POSIX.1-2001.
-.SH EXAMPLES
-.\" SRC BEGIN (catan.c)
-.EX
-/* Link with "\-lm" */
-\&
-#include <complex.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-\&
-int
-main(int argc, char *argv[])
-{
-    double complex z, c, f;
-    double complex i = I;
-\&
-    if (argc != 3) {
-        fprintf(stderr, "Usage: %s <real> <imag>\en", argv[0]);
-        exit(EXIT_FAILURE);
-    }
-\&
-    z = atof(argv[1]) + atof(argv[2]) * I;
-\&
-    c = catan(z);
-    printf("catan() = %6.3f %6.3f*i\en", creal(c), cimag(c));
-\&
-    f = (clog(1 + i * z) \- clog(1 \- i * z)) / (2 * i);
-    printf("formula = %6.3f %6.3f*i\en", creal(f), cimag(f));
-\&
-    exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR ccos (3),
-.BR clog (3),
-.BR ctan (3),
-.BR complex (7)