Average Error: 16.4 → 4.3
Time: 1.3m
Precision: 64
Internal Precision: 2944
\[\pi \cdot \ell - \frac{1}{F \cdot F} \cdot \tan \left(\pi \cdot \ell\right)\]
\[\begin{array}{l} \mathbf{if}\;\pi \cdot \ell \le -7.009633394870095 \cdot 10^{+99}:\\ \;\;\;\;\pi \cdot \ell - \frac{\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}} \cdot \sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}}{\frac{F}{\sqrt[3]{\frac{F}{\frac{\cos \left(\frac{\pi}{\ell}\right)}{\sin \left(\frac{\pi}{\ell}\right)}}}}}\\ \mathbf{if}\;\pi \cdot \ell \le -2.1761679811364737 \cdot 10^{+26}:\\ \;\;\;\;\pi \cdot \ell - \frac{\sin \left(\pi \cdot \ell\right)}{\left(F \cdot F\right) \cdot \left(\left(\frac{1}{24} \cdot \left({\pi}^{4} \cdot {\ell}^{4}\right) + 1\right) - \frac{1}{2} \cdot \left({\pi}^{2} \cdot {\ell}^{2}\right)\right)}\\ \mathbf{if}\;\pi \cdot \ell \le 2.1687705884278945 \cdot 10^{+62}:\\ \;\;\;\;\pi \cdot \ell - \frac{\frac{\tan \left(\pi \cdot \ell\right)}{F}}{F}\\ \mathbf{else}:\\ \;\;\;\;\pi \cdot \ell - \frac{\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}} \cdot \sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}}{\frac{F}{\sqrt[3]{\frac{F}{\frac{\cos \left(\frac{\pi}{\ell}\right)}{\sin \left(\frac{\pi}{\ell}\right)}}}}}\\ \end{array}\]

Error

Bits error versus F

Bits error versus l

Derivation

  1. Split input into 3 regimes
  2. if (* PI l) < -7.009633394870095e+99 or 2.1687705884278945e+62 < (* PI l)

    1. Initial program 21.7

      \[\pi \cdot \ell - \frac{1}{F \cdot F} \cdot \tan \left(\pi \cdot \ell\right)\]
    2. Applied simplify21.7

      \[\leadsto \color{blue}{\pi \cdot \ell - \frac{\tan \left(\pi \cdot \ell\right)}{F \cdot F}}\]
    3. Using strategy rm
    4. Applied associate-/r*21.7

      \[\leadsto \pi \cdot \ell - \color{blue}{\frac{\frac{\tan \left(\pi \cdot \ell\right)}{F}}{F}}\]
    5. Using strategy rm
    6. Applied add-cube-cbrt21.7

      \[\leadsto \pi \cdot \ell - \frac{\color{blue}{\left(\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}} \cdot \sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}\right) \cdot \sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}}}{F}\]
    7. Applied associate-/l*21.7

      \[\leadsto \pi \cdot \ell - \color{blue}{\frac{\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}} \cdot \sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}}{\frac{F}{\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}}}}\]
    8. Taylor expanded around inf 49.6

      \[\leadsto \pi \cdot \ell - \frac{\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}} \cdot \color{blue}{e^{\frac{1}{3} \cdot \left(\log F + \log \left(\frac{\sin \left(\frac{\pi}{\ell}\right)}{\cos \left(\frac{\pi}{\ell}\right)}\right)\right)}}}{\frac{F}{\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}}}\]
    9. Applied simplify3.9

      \[\leadsto \color{blue}{\pi \cdot \ell - \frac{\sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}} \cdot \sqrt[3]{\frac{\tan \left(\pi \cdot \ell\right)}{F}}}{\frac{F}{\sqrt[3]{\frac{F}{\frac{\cos \left(\frac{\pi}{\ell}\right)}{\sin \left(\frac{\pi}{\ell}\right)}}}}}}\]

    if -7.009633394870095e+99 < (* PI l) < -2.1761679811364737e+26

    1. Initial program 27.7

      \[\pi \cdot \ell - \frac{1}{F \cdot F} \cdot \tan \left(\pi \cdot \ell\right)\]
    2. Applied simplify27.7

      \[\leadsto \color{blue}{\pi \cdot \ell - \frac{\tan \left(\pi \cdot \ell\right)}{F \cdot F}}\]
    3. Using strategy rm
    4. Applied tan-quot27.7

      \[\leadsto \pi \cdot \ell - \frac{\color{blue}{\frac{\sin \left(\pi \cdot \ell\right)}{\cos \left(\pi \cdot \ell\right)}}}{F \cdot F}\]
    5. Applied associate-/l/27.7

      \[\leadsto \pi \cdot \ell - \color{blue}{\frac{\sin \left(\pi \cdot \ell\right)}{\left(F \cdot F\right) \cdot \cos \left(\pi \cdot \ell\right)}}\]
    6. Taylor expanded around 0 16.4

      \[\leadsto \pi \cdot \ell - \frac{\sin \left(\pi \cdot \ell\right)}{\left(F \cdot F\right) \cdot \color{blue}{\left(\left(\frac{1}{24} \cdot \left({\pi}^{4} \cdot {\ell}^{4}\right) + 1\right) - \frac{1}{2} \cdot \left({\pi}^{2} \cdot {\ell}^{2}\right)\right)}}\]

    if -2.1761679811364737e+26 < (* PI l) < 2.1687705884278945e+62

    1. Initial program 11.1

      \[\pi \cdot \ell - \frac{1}{F \cdot F} \cdot \tan \left(\pi \cdot \ell\right)\]
    2. Applied simplify10.5

      \[\leadsto \color{blue}{\pi \cdot \ell - \frac{\tan \left(\pi \cdot \ell\right)}{F \cdot F}}\]
    3. Using strategy rm
    4. Applied associate-/r*3.2

      \[\leadsto \pi \cdot \ell - \color{blue}{\frac{\frac{\tan \left(\pi \cdot \ell\right)}{F}}{F}}\]
  3. Recombined 3 regimes into one program.

Runtime

Time bar (total: 1.3m)Debug log

herbie shell --seed '#(2479486159 2123901208 2662424940 349789437 14252662 202027171)' 
(FPCore (F l)
  :name "VandenBroeck and Keller, Equation (6)"
  (- (* PI l) (* (/ 1 (* F F)) (tan (* PI l)))))