TANH
TANH
Section: Linux Programmer's Manual (3) Updated: 2010-09-20 Local index
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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 );
Link with -lm .
Feature Test Macro Requirements for glibc (see
feature_test_macros
tanhf (),
tanhl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
cc -std=c99
DESCRIPTION
The
tanh ()
function returns 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.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
acosh asinh atanh cosh ctanh sinh
COLOPHON
This page is part of release 3.27 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/.
Index
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO
COLOPHON
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