fails:Math#atanh returns the inverse hyperbolic tangent of the argument
fails:Math#atanh raises an Errno::EDOM if x = 1.0
fails:Math#atanh raises an Errno::EDOM if x = -1.0
fails:Math#atanh returns the inverse hyperbolic tangent as a Complex number for arguments greater than 1.0
fails:Math#atanh returns the inverse hyperbolic tangent for Complex numbers
fails:Math.atanh returns the inverse hyperbolic tangent of the argument
fails:Math.atanh raises an Errno::EDOM if x = 1.0
fails:Math.atanh raises an Errno::EDOM if x = -1.0
fails:Math.atanh returns the inverse hyperbolic tangent as a Complex number for arguments greater than 1.0
fails:Math.atanh returns the inverse hyperbolic tangent for Complex numbers
fails:"Math#atanh returns the inverse hyperbolic tangent of the argument"
fails:"Math#atanh raises an Errno::EDOM if x = 1.0"
fails:"Math#atanh raises an Errno::EDOM if x = -1.0"
fails:"Math#atanh returns the inverse hyperbolic tangent as a Complex number for arguments greater than 1.0"
fails:"Math#atanh returns the inverse hyperbolic tangent for Complex numbers"
fails:"Math.atanh returns the inverse hyperbolic tangent of the argument"
fails:"Math.atanh raises an Errno::EDOM if x = 1.0"
fails:"Math.atanh raises an Errno::EDOM if x = -1.0"
fails:"Math.atanh returns the inverse hyperbolic tangent as a Complex number for arguments greater than 1.0"
fails:"Math.atanh returns the inverse hyperbolic tangent for Complex numbers"
