Average Error: 0.0 → 0.0
Time: 19.2s
Precision: 64
\[\frac{x + 1}{1 - x}\]
↓
\[\frac{1 + x}{1 - x}\]
\frac{x + 1}{1 - x}
↓
\frac{1 + x}{1 - x}
double f(double x) {
        double r1373727 = x;
        double r1373728 = 1.0;
        double r1373729 = r1373727 + r1373728;
        double r1373730 = r1373728 - r1373727;
        double r1373731 = r1373729 / r1373730;
        return r1373731;
}
↓
double f(double x) {
        double r1373732 = 1.0;
        double r1373733 = x;
        double r1373734 = r1373732 + r1373733;
        double r1373735 = r1373732 - r1373733;
        double r1373736 = r1373734 / r1373735;
        return r1373736;
}

Error

Bits error versus x

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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

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

Reproduce

herbie shell --seed 2019168 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  (/ (+ x 1.0) (- 1.0 x)))