tanhf3
Hyperbolic tangent function
Part of tanh(3).
Usage
#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 <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
Library
Math library (libm, -lm)
Overview
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 |
Releases
12 releases since Debian 3.1 (Sarge); the text changed 11 times.