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NAME

       asinh, asinhf, asinhl - inverse hyperbolic sine function

SYNOPSIS

       #include <math.h>

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

       Link with -lm.

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

       asinh(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
       _ISOC99_SOURCE; or cc -std=c99
       asinhf(), asinhl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
       || _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION

       The  asinh() function calculates 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.

CONFORMING TO

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
       4.3BSD, C89.

SEE ALSO

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

COLOPHON

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