ultrix man page for atanh

asinh(3m)																 asinh(3m)

Name
       asinh, acosh, atanh - inverse hyperbolic functions

Syntax
       #include <math.h>

       double asinh(x)
       double x;

       double acosh(x)
       double x;

       double atanh(x)
       double x;

Description
       The and functions compute the designated inverse hyperbolic functions for real arguments.

   Errors Because of Roundoff, Etc.
       These functions inherit much of their error from the function.

Diagnostics
       The function returns the default quiet NaN if the argument is less than one.

       The function returns the default quiet NaN if the argument has an absolute value greater than or equal to one.

See Also
       exp(3m), math(3m)

								       RISC								 asinh(3m)