Average Error: 30.2 → 0.0
Time: 11.3s
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 r2588800 = 1.0;
        double r2588801 = x;
        double r2588802 = cos(r2588801);
        double r2588803 = r2588800 - r2588802;
        double r2588804 = sin(r2588801);
        double r2588805 = r2588803 / r2588804;
        return r2588805;
}
↓
double f(double x) {
        double r2588806 = x;
        double r2588807 = 2.0;
        double r2588808 = r2588806 / r2588807;
        double r2588809 = tan(r2588808);
        return r2588809;
}

Error

Bits error versus x

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Results

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Target

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

Derivation

  1. Initial program 30.2

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

  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 2019121 
(FPCore (x)
  :name "tanhf (example 3.4)"
  :herbie-expected 2

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

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