Average Error: 0.0 → 0.0
Time: 6.4s
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 r1468383 = x;
        double r1468384 = 1.0;
        double r1468385 = r1468383 + r1468384;
        double r1468386 = r1468384 - r1468383;
        double r1468387 = r1468385 / r1468386;
        return r1468387;
}
↓
double f(double x) {
        double r1468388 = 1.0;
        double r1468389 = x;
        double r1468390 = r1468388 + r1468389;
        double r1468391 = r1468388 - r1468389;
        double r1468392 = r1468390 / r1468391;
        return r1468392;
}

Error

Bits error versus x

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Your Program's Arguments

Results

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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)))