tanhf

Langue: en

Version: 2008-08-05 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

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)

COLOPHON

This page is part of release 3.24 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/.