atanh(3) Library Functions Manual atanh(3) atanh, atanhf, atanhl - (libm, -lm) #include double atanh(double x); float atanhf(float x); long double atanhl(long double x); glibc (. feature_test_macros(7)): atanh(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 500 || /* glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE atanhf(), atanhl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE x; x. x. x NaN, NaN. x +0 (-0), +0 (-0). x +1 -1, , HUGE_VAL, HUGE_VALF HUGE_VALL, , . x 1, , NaN. math_error(7), , . : Domain error: x less than -1 or greater than +1 errno EDOM. (FE_INVALID). Pole error: x is +1 or -1 errno ERANGE ( ). (FE_DIVBYZERO). attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |atanh(), atanhf(), atanhl() | | MT-Safe | +----------------------------+----------------------------------------------------------+--------------------------+ C11, POSIX.1-2008. C99, POSIX.1-2001. , double, SVr4, 4.3BSD. glibc 2.9 errno EDOM POSIX ERANGE. glibc 2.10, glibc . acosh(3), asinh(3), catanh(3), cosh(3), sinh(3), tanh(3) () Dmitry Bolkhovskikh Yuri Kozlov ; GNU (GNU General Public License - GPL, 3 ) , - . - , , () () () <>. Linux 6.17 8 2026 . atanh(3)