Average Error: 0.0 → 0.0
Time: 37.8s
Precision: 64
\[\frac{x + 1.0}{1.0 - x}\]
↓
\[\frac{1.0 + x}{1.0 - x}\]
\frac{x + 1.0}{1.0 - x}
↓
\frac{1.0 + x}{1.0 - x}
double f(double x) {
        double r2539637 = x;
        double r2539638 = 1.0;
        double r2539639 = r2539637 + r2539638;
        double r2539640 = r2539638 - r2539637;
        double r2539641 = r2539639 / r2539640;
        return r2539641;
}
↓
double f(double x) {
        double r2539642 = 1.0;
        double r2539643 = x;
        double r2539644 = r2539642 + r2539643;
        double r2539645 = r2539642 - r2539643;
        double r2539646 = r2539644 / r2539645;
        return r2539646;
}

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

    \[\frac{x + 1.0}{1.0 - x}\]

  2. Final simplification0.0

    \[\leadsto \frac{1.0 + x}{1.0 - x}\]

Reproduce

herbie shell --seed 2019158 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  (/ (+ x 1.0) (- 1.0 x)))