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 r40703 = x;
        double r40704 = 1.0;
        double r40705 = r40703 + r40704;
        double r40706 = r40704 - r40703;
        double r40707 = r40705 / r40706;
        return r40707;
}
↓
double f(double x) {
        double r40708 = x;
        double r40709 = 1.0;
        double r40710 = r40708 + r40709;
        double r40711 = r40709 - r40708;
        double r40712 = r40710 / r40711;
        return r40712;
}

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 2020024 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  :precision binary64
  (/ (+ x 1) (- 1 x)))