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Derivation

1. Initial program 15.0

   \[\sqrt[3]{\frac{g}{2 \cdot a}}\]

2. Initial simplification15.0

   \[\leadsto \sqrt[3]{\frac{g}{a \cdot 2}}\]
3. Using strategy rm

4. Applied div-inv15.1

   \[\leadsto \sqrt[3]{\color{blue}{g \cdot \frac{1}{a \cdot 2}}}\]

5. Applied cbrt-prod0.9

   \[\leadsto \color{blue}{\sqrt[3]{g} \cdot \sqrt[3]{\frac{1}{a \cdot 2}}}\]

6. Taylor expanded around inf 32.9

   \[\leadsto \sqrt[3]{g} \cdot \color{blue}{\left(\sqrt[3]{\frac{1}{2}} \cdot {\left(\frac{1}{a}\right)}^{\frac{1}{3}}\right)}\]

7. Simplified0.9

   \[\leadsto \sqrt[3]{g} \cdot \color{blue}{\left(\sqrt[3]{\frac{1}{a}} \cdot \sqrt[3]{\frac{1}{2}}\right)}\]

8. Taylor expanded around inf 32.9

   \[\leadsto \sqrt[3]{g} \cdot \left(\color{blue}{{\left(\frac{1}{a}\right)}^{\frac{1}{3}}} \cdot \sqrt[3]{\frac{1}{2}}\right)\]

9. Simplified0.9

   \[\leadsto \sqrt[3]{g} \cdot \left(\color{blue}{\sqrt[3]{\frac{1}{a}}} \cdot \sqrt[3]{\frac{1}{2}}\right)\]

10. Final simplification0.9

    \[\leadsto \left(\sqrt[3]{\frac{1}{2}} \cdot \sqrt[3]{\frac{1}{a}}\right) \cdot \sqrt[3]{g}\]

Reproduce

herbie shell --seed 2018362 
(FPCore (g a)
  :name "2-ancestry mixing, zero discriminant"
  (cbrt (/ g (* 2 a))))

Details

Time bar (total: 9.6s)Debug log