Average Error: 0.0 → 0.0
Time: 41.8s
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 r2010715 = x;
        double r2010716 = 1.0;
        double r2010717 = r2010715 + r2010716;
        double r2010718 = r2010716 - r2010715;
        double r2010719 = r2010717 / r2010718;
        return r2010719;
}
↓
double f(double x) {
        double r2010720 = x;
        double r2010721 = 1.0;
        double r2010722 = r2010720 + r2010721;
        double r2010723 = r2010721 - r2010720;
        double r2010724 = r2010722 / r2010723;
        return r2010724;
}

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 2019200 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  (/ (+ x 1.0) (- 1.0 x)))