Error

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Derivation

1. Initial program 14.3

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

2. Initial simplification0.3

   \[\leadsto \frac{\frac{1}{a} - \frac{1}{b}}{b - a} \cdot \frac{\frac{\pi}{2}}{a + b}\]
3. Using strategy rm

4. Applied associate-*l/0.3

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

5. Simplified0.3

   \[\leadsto \frac{\color{blue}{\frac{\frac{\pi}{a} - \frac{\pi}{b}}{\left(a + b\right) \cdot 2}}}{b - a}\]
6. Using strategy rm

7. Applied *-un-lft-identity0.3

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

8. Applied *-un-lft-identity0.3

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

9. Applied times-frac0.3

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

10. Applied times-frac0.3

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

11. Simplified0.3

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

12. Final simplification0.3

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

Reproduce

herbie shell --seed 2018360 
(FPCore (a b)
  :name "NMSE Section 6.1 mentioned, B"
  (* (* (/ PI 2) (/ 1 (- (* b b) (* a a)))) (- (/ 1 a) (/ 1 b))))

Details

Time bar (total: 28.3s)Debug log