TANH(3) manual page
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tanh, tanhf, tanhl - hyperbolic tangent
function
#include <math.h>
double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);
Link with -lm.
Feature Test Macro Requirements
for glibc (see feature_test_macros(7)
):
tanhf(), tanhl():
_BSD_SOURCE
|| _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
The tanh() function returns the hyperbolic tangent
of x, which is defined mathematically as:
tanh(x) = sinh(x) / cosh(x)
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.
No errors occur.
The tanh(),
tanhf(), and tanhl() functions are thread-safe.
C99, POSIX.1-2001.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
acosh(3)
,
asinh(3)
, atanh(3)
, cosh(3)
, ctanh(3)
, sinh(3)
This page is part
of release 3.78 of the Linux man-pages project. A description of the project,
information about reporting bugs, and the latest version of this page,
can be found at http://www.kernel.org/doc/man-pages/.
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