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+'\" t
+.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
+.\"
+.\" SPDX-License-Identifier: GPL-1.0-or-later
+.\"
+.TH ctanh 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+ctanh, ctanhf, ctanhl \- complex hyperbolic tangent
+.SH LIBRARY
+Math library
+.RI ( libm ", " \-lm )
+.SH SYNOPSIS
+.nf
+.B #include <complex.h>
+.P
+.BI "double complex ctanh(double complex " z );
+.BI "float complex ctanhf(float complex " z );
+.BI "long double complex ctanhl(long double complex " z );
+.fi
+.SH DESCRIPTION
+These functions calculate the complex hyperbolic tangent of
+.IR z .
+.P
+The complex hyperbolic tangent function is defined
+mathematically as:
+.P
+.in +4n
+.EX
+ctanh(z) = csinh(z) / ccosh(z)
+.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 ctanh (),
+.BR ctanhf (),
+.BR ctanhl ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+glibc 2.1.
+C99, POSIX.1-2001.
+.SH SEE ALSO
+.BR cabs (3),
+.BR catanh (3),
+.BR ccosh (3),
+.BR csinh (3),
+.BR complex (7)