ASINH(3M)							     ASINH(3M)

NAME    [Toc]    [Back]

     asinh, acosh, atanh - inverse hyperbolic functions

SYNOPSIS    [Toc]    [Back]

     #include <math.h>

     double asinh(double x);

     double acosh(double x);

     double atanh(double x);

DESCRIPTION    [Toc]    [Back]

     These functions compute the designated inverse hyperbolic functions for
     real arguments.

ERROR (due to Roundoff etc.)    [Toc]    [Back]

     These functions inherit much of their error from log1p described in
     exp(3M).

DIAGNOSTICS    [Toc]    [Back]

     In	the diagnostics	below, functions in the	standard math library libm.a,
     are referred to as	-lm versions, those in math library libmx.a are
     referred to as -lmx versions, and those in	the the	BSD math library
     libm43.a are referred to as -lm43 versions.  The -lm and -lmx versions
     always return the default Quiet NaN and set errno to EDOM when a NaN is
     used as an	argument.  A NaN argument usually causes the -lm43 versions to
     return the	same argument.	The -lm43 versions never set errno.

     acosh returns the default quiet NaN if the	argument is less than 1.  The
     -lm and -lmx versions also	set errno to EDOM.

     atanh returns the default quiet NaN if the	argument has absolute value
     greater than 1.  The -lm and -lmx versions	also set errno to EDOM.

     See matherr(3M) for a description of error	handling for -lmx functions.

SEE ALSO    [Toc]    [Back]

     math(3M), exp(3M),	matherr(3M)


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