1TANH(3)                    Linux Programmer's Manual                   TANH(3)
2
3
4

NAME

6       tanh, tanhf, tanhl - hyperbolic tangent function
7

SYNOPSIS

9       #include <math.h>
10
11       double tanh(double x);
12       float tanhf(float x);
13       long double tanhl(long double x);
14
15       Link with -lm.
16
17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
18
19       tanhf(), tanhl():
20           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
21               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
22               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
23

DESCRIPTION

25       These  functions  return  the hyperbolic tangent of x, which is defined
26       mathematically as:
27
28           tanh(x) = sinh(x) / cosh(x)
29

RETURN VALUE

31       On success, these functions return the hyperbolic tangent of x.
32
33       If x is a NaN, a NaN is returned.
34
35       If x is +0 (-0), +0 (-0) is returned.
36
37       If x is positive infinity (negative infinity), +1 (-1) is returned.
38

ERRORS

40       No errors occur.
41

ATTRIBUTES

43       For  an  explanation  of  the  terms  used   in   this   section,   see
44       attributes(7).
45
46       ┌─────────────────────────┬───────────────┬─────────┐
47Interface                Attribute     Value   
48       ├─────────────────────────┼───────────────┼─────────┤
49tanh(), tanhf(), tanhl() │ Thread safety │ MT-Safe │
50       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

52       C99, POSIX.1-2001, POSIX.1-2008.
53
54       The variant returning double also conforms to SVr4, 4.3BSD, C89.
55

SEE ALSO

57       acosh(3), asinh(3), atanh(3), cosh(3), ctanh(3), sinh(3)
58

COLOPHON

60       This  page  is  part of release 5.04 of the Linux man-pages project.  A
61       description of the project, information about reporting bugs,  and  the
62       latest     version     of     this    page,    can    be    found    at
63       https://www.kernel.org/doc/man-pages/.
64
65
66
67                                  2017-09-15                           TANH(3)
Impressum