# tanh(3) [netbsd man page]

TANH(3) BSD Library Functions Manual TANH(3)NAME

tanh, tanhfhyperbolic tangent function--LIBRARY

Math Library (libm, -lm)SYNOPSIS

#include <math.h> double tanh(double x); float tanhf(float x);DESCRIPTION

The tanh() and tanhf() functions compute the hyperbolic tangent of x. For a discussion of error due to roundoff, see math(3).RETURN VALUES

Upon successful completion, these functions return the hyperbolic tangent value. The following may also occur: 1. If x is +- 0, x is returned. 2. If x is NaN, a NaN is returned. 3. If x is positive infinity, a value 1 is returned; if x is negative infinity,is returned. 4. If x is subnormal, a range error can occur and x is returned.-1SEE ALSO

acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3)STANDARDS

The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').BSD

September 18, 2011 BSD

## Check Out this Related Man Page

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

tanh, tanhf, tanhl - hyperbolic tangent functionSYNOPSIS

#include <math.h> double tanh(double x); float tanhf(float x); long double tanhl(long double x); Link withFeature Test Macro Requirements for glibc (see feature_test_macros(7)): tanhf(), tanhl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc-lm.-std=c99DESCRIPTION

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 3.25 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/. 2008-08-05 TANH(3)