Average Error: 0.5 → 0.5
Time: 51.0s
Precision: 64
\[\cos^{-1} \left(\frac{1 - 5 \cdot \left(v \cdot v\right)}{v \cdot v - 1}\right)\]
\[{e}^{\left(\log \left(\cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1} \cdot \left(v \cdot v + 1\right)\right)\right)\right)}\]

Error

Bits error versus v

Derivation

  1. Initial program 0.5

    \[\cos^{-1} \left(\frac{1 - 5 \cdot \left(v \cdot v\right)}{v \cdot v - 1}\right)\]
  2. Simplified0.5

    \[\leadsto \color{blue}{\cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{v \cdot v - 1}\right)}\]
  3. Using strategy rm
  4. Applied flip--0.5

    \[\leadsto \cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\color{blue}{\frac{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1 \cdot 1}{v \cdot v + 1}}}\right)\]
  5. Applied associate-/r/0.5

    \[\leadsto \cos^{-1} \color{blue}{\left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1 \cdot 1} \cdot \left(v \cdot v + 1\right)\right)}\]
  6. Using strategy rm
  7. Applied add-exp-log0.5

    \[\leadsto \color{blue}{e^{\log \left(\cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1 \cdot 1} \cdot \left(v \cdot v + 1\right)\right)\right)}}\]
  8. Using strategy rm
  9. Applied *-un-lft-identity0.5

    \[\leadsto e^{\color{blue}{1 \cdot \log \left(\cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1 \cdot 1} \cdot \left(v \cdot v + 1\right)\right)\right)}}\]
  10. Applied exp-prod0.5

    \[\leadsto \color{blue}{{\left(e^{1}\right)}^{\left(\log \left(\cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1 \cdot 1} \cdot \left(v \cdot v + 1\right)\right)\right)\right)}}\]
  11. Simplified0.5

    \[\leadsto {\color{blue}{e}}^{\left(\log \left(\cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1 \cdot 1} \cdot \left(v \cdot v + 1\right)\right)\right)\right)}\]
  12. Final simplification0.5

    \[\leadsto {e}^{\left(\log \left(\cos^{-1} \left(\frac{(-5 \cdot \left(v \cdot v\right) + 1)_*}{\left(v \cdot v\right) \cdot \left(v \cdot v\right) - 1} \cdot \left(v \cdot v + 1\right)\right)\right)\right)}\]

Reproduce

herbie shell --seed 2019100 +o rules:numerics
(FPCore (v)
  :name "Falkner and Boettcher, Appendix B, 1"
  (acos (/ (- 1 (* 5 (* v v))) (- (* v v) 1))))