Average Error: 47.0 → 1.5
Time: 3.6m
Precision: 64
Internal Precision: 4224
\[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}\]
\[\frac{\cos k}{\sin k} \cdot \frac{\frac{\frac{2}{t}}{\frac{k}{\ell}}}{\frac{k}{\ell} \cdot \sin k}\]

Error

Bits error versus t

Bits error versus l

Bits error versus k

Derivation

  1. Initial program 47.0

    \[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}\]
  2. Using strategy rm
  3. Applied add-sqr-sqrt47.0

    \[\leadsto \frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\color{blue}{\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} \cdot \sqrt{1 + {\left(\frac{k}{t}\right)}^{2}}} - 1\right)}\]
  4. Applied difference-of-sqr-147.0

    \[\leadsto \frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \color{blue}{\left(\left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} + 1\right) \cdot \left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)\right)}}\]
  5. Applied associate-*r*47.0

    \[\leadsto \frac{2}{\color{blue}{\left(\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} + 1\right)\right) \cdot \left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)}}\]
  6. Applied simplify39.8

    \[\leadsto \frac{2}{\color{blue}{\left(\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}} \cdot (\left(\tan k\right) \cdot \left(\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^*\right) + \left(\tan k\right))_*\right)} \cdot \left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)}\]
  7. Using strategy rm
  8. Applied pow139.8

    \[\leadsto \frac{2}{\left(\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}} \cdot (\left(\tan k\right) \cdot \left(\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^*\right) + \left(\tan k\right))_*\right) \cdot \color{blue}{{\left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)}^{1}}}\]
  9. Applied pow139.8

    \[\leadsto \frac{2}{\left(\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}} \cdot \color{blue}{{\left((\left(\tan k\right) \cdot \left(\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^*\right) + \left(\tan k\right))_*\right)}^{1}}\right) \cdot {\left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)}^{1}}\]
  10. Applied pow139.8

    \[\leadsto \frac{2}{\left(\color{blue}{{\left(\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}}\right)}^{1}} \cdot {\left((\left(\tan k\right) \cdot \left(\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^*\right) + \left(\tan k\right))_*\right)}^{1}\right) \cdot {\left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)}^{1}}\]
  11. Applied pow-prod-down39.8

    \[\leadsto \frac{2}{\color{blue}{{\left(\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}} \cdot (\left(\tan k\right) \cdot \left(\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^*\right) + \left(\tan k\right))_*\right)}^{1}} \cdot {\left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)}^{1}}\]
  12. Applied pow-prod-down39.8

    \[\leadsto \frac{2}{\color{blue}{{\left(\left(\frac{\sin k \cdot t}{\frac{\ell}{t} \cdot \frac{\ell}{t}} \cdot (\left(\tan k\right) \cdot \left(\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^*\right) + \left(\tan k\right))_*\right) \cdot \left(\sqrt{1 + {\left(\frac{k}{t}\right)}^{2}} - 1\right)\right)}^{1}}}\]
  13. Applied simplify33.8

    \[\leadsto \frac{2}{{\color{blue}{\left(\frac{(\left(\tan k\right) \cdot \left(\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^*\right) + \left(\tan k\right))_*}{\frac{\frac{\ell}{t}}{t \cdot \sin k}} \cdot \frac{\sqrt{1^2 + \left(\frac{k}{t}\right)^2}^* - 1}{\frac{\ell}{t}}\right)}}^{1}}\]
  14. Taylor expanded around inf 22.6

    \[\leadsto \frac{2}{{\color{blue}{\left(\frac{{k}^{2} \cdot \left(t \cdot {\left(\sin k\right)}^{2}\right)}{{\ell}^{2} \cdot \cos k}\right)}}^{1}}\]
  15. Applied simplify10.0

    \[\leadsto \color{blue}{\frac{\frac{2}{\frac{k}{\ell} \cdot \frac{k}{\ell}}}{\frac{\sin k \cdot \sin k}{\frac{\cos k}{t}}}}\]
  16. Using strategy rm
  17. Applied div-inv10.0

    \[\leadsto \frac{\frac{2}{\frac{k}{\ell} \cdot \frac{k}{\ell}}}{\frac{\sin k \cdot \sin k}{\color{blue}{\cos k \cdot \frac{1}{t}}}}\]
  18. Applied times-frac8.5

    \[\leadsto \frac{\frac{2}{\frac{k}{\ell} \cdot \frac{k}{\ell}}}{\color{blue}{\frac{\sin k}{\cos k} \cdot \frac{\sin k}{\frac{1}{t}}}}\]
  19. Applied *-un-lft-identity8.5

    \[\leadsto \frac{\color{blue}{1 \cdot \frac{2}{\frac{k}{\ell} \cdot \frac{k}{\ell}}}}{\frac{\sin k}{\cos k} \cdot \frac{\sin k}{\frac{1}{t}}}\]
  20. Applied times-frac7.8

    \[\leadsto \color{blue}{\frac{1}{\frac{\sin k}{\cos k}} \cdot \frac{\frac{2}{\frac{k}{\ell} \cdot \frac{k}{\ell}}}{\frac{\sin k}{\frac{1}{t}}}}\]
  21. Applied simplify7.8

    \[\leadsto \color{blue}{\frac{\cos k}{\sin k}} \cdot \frac{\frac{2}{\frac{k}{\ell} \cdot \frac{k}{\ell}}}{\frac{\sin k}{\frac{1}{t}}}\]
  22. Applied simplify1.5

    \[\leadsto \frac{\cos k}{\sin k} \cdot \color{blue}{\frac{\frac{\frac{2}{t}}{\frac{k}{\ell}}}{\frac{k}{\ell} \cdot \sin k}}\]

Runtime

Time bar (total: 3.6m)Debug logProfile

herbie shell --seed '#(1070355188 2193211668 3977393919 3454156579 3755371326 1656365382)' +o rules:numerics
(FPCore (t l k)
  :name "Toniolo and Linder, Equation (10-)"
  (/ 2 (* (* (* (/ (pow t 3) (* l l)) (sin k)) (tan k)) (- (+ 1 (pow (/ k t) 2)) 1))))