@c ----------------------------------------------------------------------
@node asinh, math
@subheading Syntax

@example
#include <math.h>

double asinh(double x);
@end example

@subheading Description

This function returns the inverse hyperbolic sine of the argument
@var{x}. 

@subheading Return Value

The inverse hyperbolic sine of @var{x}.  If the argument @var{x} is a
@code{NaN}, the return value is @code{NaN} and @code{errno} is set to
@code{EDOM}.  If @var{x} is a positive or negative @code{Inf}, the
return value is equal to the value of @var{x}, and @code{errno} is left
unchanged.

@subheading Portability

@portability !ansi, !posix