NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO |
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tanh(3) Library Functions Manual tanh(3)
tanh, tanhf, tanhl - hyperbolic tangent function
Math library (libm, -lm)
#include <math.h> double tanh(double x); float tanhf(float x); long double tanhl(long double x); 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 <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the hyperbolic tangent of x, which is defined mathematically as: tanh(x) = sinh(x) / cosh(x)
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.
No errors occur.
For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │tanh(), tanhf(), tanhl() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
acosh(3), asinh(3), atanh(3), cosh(3), ctanh(3), sinh(3)
Linux man-pages 6.04 2023-03-30 tanh(3)
Pages that refer to this page: acosh(3), asinh(3), atanh(3), cosh(3), sinh(3)