table of contents
tanh(3) | Library Functions Manual | tanh(3) |
NAME¶
tanh, tanhf, tanhl - hyperbolic tangent function
LIBRARY¶
Math library (libm, -lm)
SYNOPSIS¶
#include <math.h>
double tanh(double x); float tanhf(float x); long double tanhl(long double x);
tanhf(), tanhl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 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 |
STANDARDS¶
C11, POSIX.1-2008.
HISTORY¶
C99, POSIX.1-2001.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO¶
2024-05-02 | Linux man-pages 6.9.1 |