Average Error: 29.9 → 0.0
Time: 11.2s
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 r997079 = 1.0;
        double r997080 = x;
        double r997081 = cos(r997080);
        double r997082 = r997079 - r997081;
        double r997083 = sin(r997080);
        double r997084 = r997082 / r997083;
        return r997084;
}
↓
double f(double x) {
        double r997085 = x;
        double r997086 = 2.0;
        double r997087 = r997085 / r997086;
        double r997088 = tan(r997087);
        return r997088;
}

Error

Bits error versus x

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Your Program's Arguments

Results

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Target

Original29.9
Target0.0
Herbie0.0
\[\tan \left(\frac{x}{2}\right)\]

Derivation

  1. Initial program 29.9

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

  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 2019135 
(FPCore (x)
  :name "tanhf (example 3.4)"
  :herbie-expected 2

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

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