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TANH(3)
TANH(3) Linux Programmer's Manual TANH(3)

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 || _POSIX_C_SOURCE >= 200112L;
 
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)

COLOPHON

This page is part of release 3.53 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