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Linux and UNIX Man Pages

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Linux 2.6 - man page for tanhl (linux section 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(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
These functions return 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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-------------------------+---------------+---------+ |Interface | Attribute | Value | +-------------------------+---------------+---------+ |tanh(), tanhf(), tanhl() | Thread safety | MT-Safe | +-------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008. 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) 2017-09-15 TANH(3)

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