The following from man atanh has an error. Should not refer tp acosh()
DESCRIPTION
The atanh() function calculates the inverse hyperbolic tangent
of x;
that is the value whose hyperbolic tangent is x. If the
absolute
value of x is greater than 1.0, acosh() returns not-a-number
(NaN) and
errno is set.
Does anyone know where this is created.
Regards,
Jerry