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# TANH

Section: Linux Programmer's Manual (3)
Updated: 2017-09-15

## NAME

tanh, tanhf, tanhl - hyperbolic tangent function

## SYNOPSIS

```#include <math.h>

double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);
```

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

tanhf(), tanhl():

_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

## DESCRIPTION

These functions return the hyperbolic tangent of x, which is defined mathematically as:

```    tanh(x) = sinh(x) / cosh(x)
```

## RETURN VALUE

On success, these functions return the hyperbolic tangent of x.

If x is a NaN, a NaN is returned.

If x is +0 (-0), +0 (-0) is returned.

If x is positive infinity (negative infinity), +1 (-1) is returned.

## ERRORS

No errors occur.

## ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
 Interface Attribute Value tanh(), tanhf(), tanhl() Thread safety MT-Safe

## CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.

The variant returning double also conforms to SVr4, 4.3BSD, C89.

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

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO