asinh(3)

NAME
     asinh, acosh, atanh - inverse hyperbolic functions

SYNOPSIS
     #include <math.h>

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

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

DIAGNOSTICS
     acosh(x) = NaN with signal if x < 1.
     acosh(NaN) = NaN without signal.

     atanh(x) = NaN with signal if |x| > 1.
     atanh(+1) = +Inf with signal.
     atanh(NaN) = that NaN without signal.

SEE ALSO
     math(3), exp(3).

AUTHOR
     W. Kahan, Kwok-Choi Ng