Average Error: 0.0 → 0.0
Time: 747.0ms
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 r47975 = x;
        double r47976 = 1.0;
        double r47977 = r47975 + r47976;
        double r47978 = r47976 - r47975;
        double r47979 = r47977 / r47978;
        return r47979;
}
↓
double f(double x) {
        double r47980 = x;
        double r47981 = 1.0;
        double r47982 = r47980 + r47981;
        double r47983 = r47981 - r47980;
        double r47984 = r47982 / r47983;
        return r47984;
}

Error

Bits error versus x

Try it out

Your Program's Arguments

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 2020047 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  :precision binary64
  (/ (+ x 1) (- 1 x)))