asinh(3M)

NAME
     asinh, acosh, atanh - inverse hyperbolic functions

SYNOPSIS
     #include <math.h>

     double asinh(double x);
     double acosh(double x);
     double atanh(double x);

IMPLEMENTATION
     IRIX systems

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

     Roundoff errors are derived from log1p, described in exp(3M).

     Functions in the standard math library (libm.a) are referred to as -lm
     versions. Those in mathx 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.

RETURN VALUES
     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 an 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
     math(3M), exp(3M), matherr(3M)

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