Average Error: 37.1 → 12.8
Time: 1.8m
Precision: 64
Internal Precision: 2432
\[\tan \left(x + \varepsilon\right) - \tan x\]
\[\frac{\sin \varepsilon}{\left(1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}\right) \cdot \cos \varepsilon} - \sqrt[3]{{\left(\frac{\sin x}{\cos x} - \frac{\frac{\sin x}{\cos x}}{1 - \frac{\sin \varepsilon}{\cos \varepsilon} \cdot \frac{\sin x}{\cos x}}\right)}^{3}}\]

Error

Bits error versus x

Bits error versus eps

Target

Original37.1
Target15.4
Herbie12.8
\[\frac{\sin \varepsilon}{\cos x \cdot \cos \left(x + \varepsilon\right)}\]

Derivation

  1. Initial program 37.1

    \[\tan \left(x + \varepsilon\right) - \tan x\]
  2. Using strategy rm
  3. Applied tan-sum21.6

    \[\leadsto \color{blue}{\frac{\tan x + \tan \varepsilon}{1 - \tan x \cdot \tan \varepsilon}} - \tan x\]
  4. Using strategy rm
  5. Applied add-cbrt-cube21.6

    \[\leadsto \frac{\tan x + \tan \varepsilon}{1 - \tan x \cdot \color{blue}{\sqrt[3]{\left(\tan \varepsilon \cdot \tan \varepsilon\right) \cdot \tan \varepsilon}}} - \tan x\]
  6. Applied add-cbrt-cube21.7

    \[\leadsto \frac{\tan x + \tan \varepsilon}{1 - \color{blue}{\sqrt[3]{\left(\tan x \cdot \tan x\right) \cdot \tan x}} \cdot \sqrt[3]{\left(\tan \varepsilon \cdot \tan \varepsilon\right) \cdot \tan \varepsilon}} - \tan x\]
  7. Applied cbrt-unprod21.6

    \[\leadsto \frac{\tan x + \tan \varepsilon}{1 - \color{blue}{\sqrt[3]{\left(\left(\tan x \cdot \tan x\right) \cdot \tan x\right) \cdot \left(\left(\tan \varepsilon \cdot \tan \varepsilon\right) \cdot \tan \varepsilon\right)}}} - \tan x\]
  8. Applied simplify21.6

    \[\leadsto \frac{\tan x + \tan \varepsilon}{1 - \sqrt[3]{\color{blue}{{\left(\tan \varepsilon \cdot \tan x\right)}^{3}}}} - \tan x\]
  9. Taylor expanded around -inf 33.0

    \[\leadsto \color{blue}{\left(\frac{\sin x}{\left(1 - {\left({\left(\frac{\sin x \cdot \sin \varepsilon}{\cos \varepsilon \cdot \cos x}\right)}^{3}\right)}^{\frac{1}{3}}\right) \cdot \cos x} + \frac{\sin \varepsilon}{\left(1 - {\left({\left(\frac{\sin x \cdot \sin \varepsilon}{\cos \varepsilon \cdot \cos x}\right)}^{3}\right)}^{\frac{1}{3}}\right) \cdot \cos \varepsilon}\right) - \frac{\sin x}{\cos x}}\]
  10. Applied simplify12.8

    \[\leadsto \color{blue}{\frac{\sin \varepsilon}{\left(1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}\right) \cdot \cos \varepsilon} - \left(\frac{\sin x}{\cos x} - \frac{\frac{\sin x}{1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}}}{\cos x}\right)}\]
  11. Using strategy rm
  12. Applied add-cbrt-cube12.8

    \[\leadsto \frac{\sin \varepsilon}{\left(1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}\right) \cdot \cos \varepsilon} - \color{blue}{\sqrt[3]{\left(\left(\frac{\sin x}{\cos x} - \frac{\frac{\sin x}{1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}}}{\cos x}\right) \cdot \left(\frac{\sin x}{\cos x} - \frac{\frac{\sin x}{1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}}}{\cos x}\right)\right) \cdot \left(\frac{\sin x}{\cos x} - \frac{\frac{\sin x}{1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}}}{\cos x}\right)}}\]
  13. Applied simplify12.8

    \[\leadsto \frac{\sin \varepsilon}{\left(1 - \frac{\sin x}{\cos x} \cdot \frac{\sin \varepsilon}{\cos \varepsilon}\right) \cdot \cos \varepsilon} - \sqrt[3]{\color{blue}{{\left(\frac{\sin x}{\cos x} - \frac{\frac{\sin x}{\cos x}}{1 - \frac{\sin \varepsilon}{\cos \varepsilon} \cdot \frac{\sin x}{\cos x}}\right)}^{3}}}\]

Runtime

Time bar (total: 1.8m)Debug logProfile

herbie shell --seed '#(1070960995 739739648 2531964651 3069671617 351857262 3877178482)' 
(FPCore (x eps)
  :name "2tan (problem 3.3.2)"

  :herbie-target
  (/ (sin eps) (* (cos x) (cos (+ x eps))))

  (- (tan (+ x eps)) (tan x)))