TANH
Section: Linux Programmer's Manual (3)
Updated: 2008-08-05
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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(7)):
tanhf(),
tanhl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or
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(3),
asinh(3),
atanh(3),
cosh(3),
ctanh(3),
sinh(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
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