Average Error: 0.0 → 0.0
Time: 39.8s
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 r45948 = x;
        double r45949 = 1.0;
        double r45950 = r45948 + r45949;
        double r45951 = r45949 - r45948;
        double r45952 = r45950 / r45951;
        return r45952;
}
↓
double f(double x) {
        double r45953 = x;
        double r45954 = 1.0;
        double r45955 = r45953 + r45954;
        double r45956 = r45954 - r45953;
        double r45957 = r45955 / r45956;
        return r45957;
}

Error

Bits error versus x

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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 2019200 
(FPCore (x)
  :name "Prelude:atanh from fay-base-0.20.0.1"
  (/ (+ x 1) (- 1 x)))