Average Error: 0.0 → 0.0
Time: 1.2s
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 r39977 = x;
        double r39978 = 1.0;
        double r39979 = r39977 + r39978;
        double r39980 = r39978 - r39977;
        double r39981 = r39979 / r39980;
        return r39981;
}
↓
double f(double x) {
        double r39982 = x;
        double r39983 = 1.0;
        double r39984 = r39982 + r39983;
        double r39985 = r39983 - r39982;
        double r39986 = r39984 / r39985;
        return r39986;
}

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 2019322 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  :precision binary64
  (/ (+ x 1) (- 1 x)))