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tanh(3) [freebsd man page]

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

NAME
tanh, tanhf, tanhl -- hyperbolic tangent functions LIBRARY
Math Library (libm, -lm) SYNOPSIS
#include <math.h> double tanh(double x); float tanhf(float x); long double tanhl(long double x); DESCRIPTION
The tanh(), tanhf(), and tanhl() functions compute the hyperbolic tangent of x. For a discussion of error due to roundoff, see math(3). RETURN VALUES
The tanh(), tanhf(), and the tanhl() functions return the hyperbolic tangent value. SEE ALSO
acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), ctanh(3), math(3), sin(3), sinh(3), tan(3) STANDARDS
The tanh() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD
August 17, 2013 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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