\[\frac{\frac{\left(i \cdot i\right) \cdot \left(i \cdot i\right)}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right)}}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right) - 1.0}\]

↓

\[\begin{array}{l} \mathbf{if}\;i \le 239.2586400500751:\\ \;\;\;\;\frac{\frac{i}{2} \cdot \frac{i}{2}}{(\left(i + i\right) \cdot \left(i + i\right) + \left(-1.0\right))_*}\\ \mathbf{else}:\\ \;\;\;\;\frac{1}{16} + \left(\frac{0.00390625}{{i}^{4}} + \frac{\frac{0.015625}{i}}{i}\right)\\ \end{array}\]

Derivation

Split input into 2 regimes
if i < 239.2586400500751
1. Initial program 43.5
  \[\frac{\frac{\left(i \cdot i\right) \cdot \left(i \cdot i\right)}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right)}}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right) - 1.0}\]
2. Applied simplify0.0
  \[\leadsto \color{blue}{\frac{\frac{i}{2} \cdot \frac{i}{2}}{(\left(i + i\right) \cdot \left(i + i\right) + \left(-1.0\right))_*}}\]
if 239.2586400500751 < i
1. Initial program 46.3
  \[\frac{\frac{\left(i \cdot i\right) \cdot \left(i \cdot i\right)}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right)}}{\left(2 \cdot i\right) \cdot \left(2 \cdot i\right) - 1.0}\]
2. Applied simplify31.6
  \[\leadsto \color{blue}{\frac{\frac{i}{2} \cdot \frac{i}{2}}{(\left(i + i\right) \cdot \left(i + i\right) + \left(-1.0\right))_*}}\]
3. Taylor expanded around inf 0.0
  \[\leadsto \color{blue}{0.00390625 \cdot \frac{1}{{i}^{4}} + \left(\frac{1}{16} + 0.015625 \cdot \frac{1}{{i}^{2}}\right)}\]
4. Applied simplify0.0
  \[\leadsto \color{blue}{\frac{1}{16} + \left(\frac{0.00390625}{{i}^{4}} + \frac{\frac{0.015625}{i}}{i}\right)}\]
Recombined 2 regimes into one program.

Runtime

herbie shell --seed '#(1070258749 1877548225 2229079127 1588002776 3179087814 1886870650)' +o rules:numerics
(FPCore (i)
  :name "Octave 3.8, jcobi/4, as called"
  :pre (and (> i 0))
  (/ (/ (* (* i i) (* i i)) (* (* 2 i) (* 2 i))) (- (* (* 2 i) (* 2 i)) 1.0)))

Error

Derivation

`if i < 239.2586400500751`

`if 239.2586400500751 < i`

Runtime