Average Error: 0.0 → 0.0
Time: 9.5s
Precision: 64
\[\frac{x + 1}{1 - x}\]
↓
\[\frac{x + 1}{1 - x}\]
\frac{x + 1}{1 - x}
↓
\frac{x + 1}{1 - x}
double f(double x) {
        double r2299805 = x;
        double r2299806 = 1.0;
        double r2299807 = r2299805 + r2299806;
        double r2299808 = r2299806 - r2299805;
        double r2299809 = r2299807 / r2299808;
        return r2299809;
}
↓
double f(double x) {
        double r2299810 = x;
        double r2299811 = 1.0;
        double r2299812 = r2299810 + r2299811;
        double r2299813 = r2299811 - r2299810;
        double r2299814 = r2299812 / r2299813;
        return r2299814;
}

Error

Bits error versus x

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Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0.0

    \[\frac{x + 1}{1 - x}\]

  2. Final simplification0.0

    \[\leadsto \frac{x + 1}{1 - x}\]

Reproduce

herbie shell --seed 2019174 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  (/ (+ x 1.0) (- 1.0 x)))