| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | SEE ALSO | COLOPHON | The Linux Programming Interface |
TANH(3) Linux Programmer's Manual TANH(3)
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.
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 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
2010-09-20 TANH(3)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface