Average Error: 0.0 → 0.0
Time: 13.8s
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 r39372 = x;
        double r39373 = 1.0;
        double r39374 = r39372 + r39373;
        double r39375 = r39373 - r39372;
        double r39376 = r39374 / r39375;
        return r39376;
}
↓
double f(double x) {
        double r39377 = x;
        double r39378 = 1.0;
        double r39379 = r39377 + r39378;
        double r39380 = r39378 - r39377;
        double r39381 = r39379 / r39380;
        return r39381;
}

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 2019323 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  :precision binary64
  (/ (+ x 1) (- 1 x)))