Average Error: 30.9 → 0.0
Time: 11.6s
Precision: 64
\[\frac{1 - \cos x}{\sin x}\]
↓
\[\tan \left(\frac{x}{2}\right)\]
\frac{1 - \cos x}{\sin x}
↓
\tan \left(\frac{x}{2}\right)
double f(double x) {
        double r1156057 = 1.0;
        double r1156058 = x;
        double r1156059 = cos(r1156058);
        double r1156060 = r1156057 - r1156059;
        double r1156061 = sin(r1156058);
        double r1156062 = r1156060 / r1156061;
        return r1156062;
}
↓
double f(double x) {
        double r1156063 = x;
        double r1156064 = 2.0;
        double r1156065 = r1156063 / r1156064;
        double r1156066 = tan(r1156065);
        return r1156066;
}

Error

Bits error versus x

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Results

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Target

Original30.9
Target0.0
Herbie0.0
\[\tan \left(\frac{x}{2}\right)\]

Derivation

  1. Initial program 30.9

    \[\frac{1 - \cos x}{\sin x}\]

  2. Simplified0.0

    \[\leadsto \color{blue}{\tan \left(\frac{x}{2}\right)}\]

  3. Final simplification0.0

    \[\leadsto \tan \left(\frac{x}{2}\right)\]

Reproduce

herbie shell --seed 2019137 
(FPCore (x)
  :name "tanhf (example 3.4)"
  :herbie-expected 2

  :herbie-target
  (tan (/ x 2))

  (/ (- 1 (cos x)) (sin x)))