Average Error: 12.6 → 9.0
Time: 41.5s
Precision: 64
Internal Precision: 128
\[\frac{\sin ky}{\sqrt{{\left(\sin kx\right)}^{2} + {\left(\sin ky\right)}^{2}}} \cdot \sin th\]
\[\frac{\sin th}{\frac{\sqrt{\left(\sin ky\right)^2 + \left(\sin kx\right)^2}^*}{\sin ky}}\]

Error

Bits error versus kx

Bits error versus ky

Bits error versus th

Derivation

  1. Initial program 12.6

    \[\frac{\sin ky}{\sqrt{{\left(\sin kx\right)}^{2} + {\left(\sin ky\right)}^{2}}} \cdot \sin th\]
  2. Simplified11.5

    \[\leadsto \color{blue}{\frac{\sin th \cdot \sin ky}{\sqrt{\left(\sin kx\right)^2 + \left(\sin ky\right)^2}^*}}\]
  3. Using strategy rm
  4. Applied associate-/l*9.0

    \[\leadsto \color{blue}{\frac{\sin th}{\frac{\sqrt{\left(\sin kx\right)^2 + \left(\sin ky\right)^2}^*}{\sin ky}}}\]
  5. Using strategy rm
  6. Applied div-inv9.1

    \[\leadsto \frac{\sin th}{\color{blue}{\sqrt{\left(\sin kx\right)^2 + \left(\sin ky\right)^2}^* \cdot \frac{1}{\sin ky}}}\]
  7. Taylor expanded around -inf 12.7

    \[\leadsto \frac{\sin th}{\color{blue}{\sqrt{{\left(\sin ky\right)}^{2} + {\left(\sin kx\right)}^{2}} \cdot \frac{1}{\sin ky}}}\]
  8. Simplified9.0

    \[\leadsto \frac{\sin th}{\color{blue}{\frac{\sqrt{\left(\sin ky\right)^2 + \left(\sin kx\right)^2}^*}{\sin ky}}}\]
  9. Final simplification9.0

    \[\leadsto \frac{\sin th}{\frac{\sqrt{\left(\sin ky\right)^2 + \left(\sin kx\right)^2}^*}{\sin ky}}\]

Reproduce

herbie shell --seed 2019068 +o rules:numerics
(FPCore (kx ky th)
  :name "Toniolo and Linder, Equation (3b), real"
  (* (/ (sin ky) (sqrt (+ (pow (sin kx) 2) (pow (sin ky) 2)))) (sin th)))