Cannot sample enough valid points. (more)

\[\log \left(\frac{\log \left(\frac{1 + e^{x}}{1 - e^{x}}\right)}{2}\right)\]
\log \left(\frac{\log \left(\frac{1 + e^{x}}{1 - e^{x}}\right)}{2}\right)
double code(double x) {
	return ((double) log(((double) (((double) log(((double) (((double) (1.0 + ((double) exp(x)))) / ((double) (1.0 - ((double) exp(x)))))))) / 2.0))));
}

Reproduce

herbie shell --seed 2020153 
(FPCore (x)
  :name "(log (/ (log (/ (+ 1 (exp x)) (- 1 (exp x)))) 2))"
  :precision binary64
  (log (/ (log (/ (+ 1.0 (exp x)) (- 1.0 (exp x)))) 2.0)))