NAME¶

asinh, asinhf, asinhl - inverse hyperbolic sine function

LIBRARY¶

Math library (libm, -lm)

SYNOPSIS¶

#include <math.h>

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

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¶

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

RETURN VALUE¶

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¶

No errors occur.

ATTRIBUTES¶

For an explanation of the terms used in this section, see attributes(7).

STANDARDS¶

C11, POSIX.1-2008.

HISTORY¶

C99, POSIX.1-2001.

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

SEE ALSO¶

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