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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\" <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\" Linux libc source code
-.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\" 386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 2002-07-27 by Walter Harms
-.\" (walter.harms@informatik.uni-oldenburg.de)
-.\"
-.TH tanh 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-tanh, tanhf, tanhl \- hyperbolic tangent function
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double tanh(double " x );
-.BI "float tanhf(float " x );
-.BI "long double tanhl(long double " x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR tanhf (),
-.BR tanhl ():
-.nf
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
- || /* Since glibc 2.19: */ _DEFAULT_SOURCE
- || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions return the hyperbolic tangent of
-.IR x ,
-which
-is defined mathematically as:
-.P
-.nf
- tanh(x) = sinh(x) / cosh(x)
-.fi
-.SH RETURN VALUE
-On success, these functions return the hyperbolic tangent of
-.IR x .
-.P
-If
-.I x
-is a NaN, a NaN is returned.
-.P
-If
-.I x
-is +0 (\-0), +0 (\-0) is returned.
-.P
-If
-.I x
-is positive infinity (negative infinity),
-+1 (\-1) is returned.
-.\"
-.\" POSIX.1-2001 documents an optional range error (underflow)
-.\" for subnormal x;
-.\" glibc 2.8 does not do this.
-.SH ERRORS
-No errors occur.
-.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 tanh (),
-.BR tanhf (),
-.BR tanhl ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.P
-The variant returning
-.I double
-also conforms to
-SVr4, 4.3BSD, C89.
-.SH SEE ALSO
-.BR acosh (3),
-.BR asinh (3),
-.BR atanh (3),
-.BR cosh (3),
-.BR ctanh (3),
-.BR sinh (3)