Average Error: 14.2 → 0.3
Time: 1.1m
Precision: 64
Internal Precision: 576
\[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]
\[\frac{\frac{\frac{1}{2}}{a} - \frac{\frac{1}{2}}{b}}{a + b} \cdot \frac{\pi}{b - a}\]

Error

Bits error versus a

Bits error versus b

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Your Program's Arguments

Results

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Derivation

  1. Initial program 14.2

    \[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]
  2. Initial simplification9.5

    \[\leadsto \frac{(\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \left(\frac{\frac{\pi}{2}}{a}\right))_*}{\left(a + b\right) \cdot \left(b - a\right)}\]
  3. Using strategy rm
  4. Applied *-un-lft-identity9.5

    \[\leadsto \frac{\color{blue}{1 \cdot (\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \left(\frac{\frac{\pi}{2}}{a}\right))_*}}{\left(a + b\right) \cdot \left(b - a\right)}\]
  5. Applied times-frac0.3

    \[\leadsto \color{blue}{\frac{1}{a + b} \cdot \frac{(\left(\frac{\pi}{2}\right) \cdot \left(\frac{-1}{b}\right) + \left(\frac{\frac{\pi}{2}}{a}\right))_*}{b - a}}\]
  6. Simplified0.3

    \[\leadsto \frac{1}{a + b} \cdot \color{blue}{\frac{\frac{\pi}{a \cdot 2} - \frac{\pi}{2 \cdot b}}{b - a}}\]
  7. Using strategy rm
  8. Applied *-un-lft-identity0.3

    \[\leadsto \frac{1}{a + b} \cdot \frac{\frac{\pi}{a \cdot 2} - \frac{\pi}{2 \cdot b}}{\color{blue}{1 \cdot \left(b - a\right)}}\]
  9. Applied div-inv0.3

    \[\leadsto \frac{1}{a + b} \cdot \frac{\frac{\pi}{a \cdot 2} - \color{blue}{\pi \cdot \frac{1}{2 \cdot b}}}{1 \cdot \left(b - a\right)}\]
  10. Applied div-inv0.3

    \[\leadsto \frac{1}{a + b} \cdot \frac{\color{blue}{\pi \cdot \frac{1}{a \cdot 2}} - \pi \cdot \frac{1}{2 \cdot b}}{1 \cdot \left(b - a\right)}\]
  11. Applied distribute-lft-out--0.3

    \[\leadsto \frac{1}{a + b} \cdot \frac{\color{blue}{\pi \cdot \left(\frac{1}{a \cdot 2} - \frac{1}{2 \cdot b}\right)}}{1 \cdot \left(b - a\right)}\]
  12. Applied times-frac0.3

    \[\leadsto \frac{1}{a + b} \cdot \color{blue}{\left(\frac{\pi}{1} \cdot \frac{\frac{1}{a \cdot 2} - \frac{1}{2 \cdot b}}{b - a}\right)}\]
  13. Applied associate-*r*0.3

    \[\leadsto \color{blue}{\left(\frac{1}{a + b} \cdot \frac{\pi}{1}\right) \cdot \frac{\frac{1}{a \cdot 2} - \frac{1}{2 \cdot b}}{b - a}}\]
  14. Simplified0.3

    \[\leadsto \left(\frac{1}{a + b} \cdot \frac{\pi}{1}\right) \cdot \color{blue}{\frac{\frac{1}{2 \cdot a} - \frac{\frac{1}{2}}{b}}{b - a}}\]
  15. Using strategy rm
  16. Applied associate-*r/0.3

    \[\leadsto \color{blue}{\frac{\frac{1}{a + b} \cdot \pi}{1}} \cdot \frac{\frac{1}{2 \cdot a} - \frac{\frac{1}{2}}{b}}{b - a}\]
  17. Applied associate-*l/0.3

    \[\leadsto \color{blue}{\frac{\left(\frac{1}{a + b} \cdot \pi\right) \cdot \frac{\frac{1}{2 \cdot a} - \frac{\frac{1}{2}}{b}}{b - a}}{1}}\]
  18. Simplified0.3

    \[\leadsto \frac{\color{blue}{\frac{\frac{\frac{1}{2}}{a} - \frac{\frac{1}{2}}{b}}{a + b} \cdot \frac{\pi}{b - a}}}{1}\]
  19. Final simplification0.3

    \[\leadsto \frac{\frac{\frac{1}{2}}{a} - \frac{\frac{1}{2}}{b}}{a + b} \cdot \frac{\pi}{b - a}\]

Runtime

Time bar (total: 1.1m)Debug logProfile

herbie shell --seed 2018235 +o rules:numerics
(FPCore (a b)
  :name "NMSE Section 6.1 mentioned, B"
  (* (* (/ PI 2) (/ 1 (- (* b b) (* a a)))) (- (/ 1 a) (/ 1 b))))