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tanh(3) [netbsd man page]

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

NAME
tanh, tanhf -- hyperbolic 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, -1 is returned. 4. If x is subnormal, a range error can occur and x is returned. SEE 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

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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; 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 3.25 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)
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