asinh(3) — Linux manual page

asinh(3)                 Library Functions Manual                asinh(3)

NAME         top

       asinh, asinhf, asinhl - inverse hyperbolic sine function

LIBRARY         top

       Math library (libm, -lm)

SYNOPSIS         top

       #include <math.h>

       double asinh(double x);
       float asinhf(float x);
       long double asinhl(long double x);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       asinh():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
               || _XOPEN_SOURCE >= 500
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

       asinhf(), asinhl():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION         top

       These functions calculate the inverse hyperbolic sine of x; that
       is the value whose hyperbolic sine is x.

RETURN VALUE         top

       On success, these functions return the inverse hyperbolic sine 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), positive infinity
       (negative infinity) is returned.

ERRORS         top

       No errors occur.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                            │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │ asinh(), asinhf(), asinhl()          │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       C99, POSIX.1-2001.

       The variant returning double also conforms to SVr4, 4.3BSD.

SEE ALSO         top

       acosh(3), atanh(3), casinh(3), cosh(3), sinh(3), tanh(3)

COLOPHON         top

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Linux man-pages 6.15            2025-05-17                       asinh(3)

Pages that refer to this page: acosh(3),  atanh(3),  casinh(3),  cosh(3),  sinh(3),  tanh(3)

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