Average Error: 14.1 → 0.3
Time: 9.6m
Precision: 64
Internal Precision: 128
\[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]
\[\frac{\frac{\pi}{b - a}}{a \cdot b} \cdot \frac{1}{\frac{b + a}{\left(b - a\right) \cdot \frac{1}{2}}}\]

Error

Bits error versus a

Bits error versus b

Derivation

  1. Initial program 14.1

    \[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]
  2. Simplified14.1

    \[\leadsto \color{blue}{\frac{\frac{\pi}{b \cdot b - a \cdot a}}{\frac{2}{\frac{1}{a} - \frac{1}{b}}}}\]
  3. Using strategy rm
  4. Applied frac-sub14.1

    \[\leadsto \frac{\frac{\pi}{b \cdot b - a \cdot a}}{\frac{2}{\color{blue}{\frac{1 \cdot b - a \cdot 1}{a \cdot b}}}}\]
  5. Applied associate-/r/14.1

    \[\leadsto \frac{\frac{\pi}{b \cdot b - a \cdot a}}{\color{blue}{\frac{2}{1 \cdot b - a \cdot 1} \cdot \left(a \cdot b\right)}}\]
  6. Applied difference-of-squares9.2

    \[\leadsto \frac{\frac{\pi}{\color{blue}{\left(b + a\right) \cdot \left(b - a\right)}}}{\frac{2}{1 \cdot b - a \cdot 1} \cdot \left(a \cdot b\right)}\]
  7. Applied *-un-lft-identity9.2

    \[\leadsto \frac{\frac{\color{blue}{1 \cdot \pi}}{\left(b + a\right) \cdot \left(b - a\right)}}{\frac{2}{1 \cdot b - a \cdot 1} \cdot \left(a \cdot b\right)}\]
  8. Applied times-frac8.6

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

    \[\leadsto \color{blue}{\frac{\frac{1}{b + a}}{\frac{2}{1 \cdot b - a \cdot 1}} \cdot \frac{\frac{\pi}{b - a}}{a \cdot b}}\]
  10. Simplified0.3

    \[\leadsto \color{blue}{\frac{\left(b - a\right) \cdot \frac{1}{2}}{b + a}} \cdot \frac{\frac{\pi}{b - a}}{a \cdot b}\]
  11. Using strategy rm
  12. Applied clear-num0.3

    \[\leadsto \color{blue}{\frac{1}{\frac{b + a}{\left(b - a\right) \cdot \frac{1}{2}}}} \cdot \frac{\frac{\pi}{b - a}}{a \cdot b}\]
  13. Final simplification0.3

    \[\leadsto \frac{\frac{\pi}{b - a}}{a \cdot b} \cdot \frac{1}{\frac{b + a}{\left(b - a\right) \cdot \frac{1}{2}}}\]

Reproduce

herbie shell --seed 2019090 
(FPCore (a b)
  :name "NMSE Section 6.1 mentioned, B"
  (* (* (/ PI 2) (/ 1 (- (* b b) (* a a)))) (- (/ 1 a) (/ 1 b))))