Average Error: 36.7 → 0.4
Time: 42.6s
Precision: 64
Internal Precision: 128
\[\tan \left(x + \varepsilon\right) - \tan x\]
\[\frac{\left(\tan \varepsilon \cdot \sin x\right) \cdot \tan x + \frac{\cos x \cdot \sin \varepsilon}{\cos \varepsilon}}{\cos x - \tan x \cdot \left(\cos x \cdot \tan \varepsilon\right)}\]

Error

Bits error versus x

Bits error versus eps

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Your Program's Arguments

Results

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Target

Original36.7
Target15.1
Herbie0.4
\[\frac{\sin \varepsilon}{\cos x \cdot \cos \left(x + \varepsilon\right)}\]

Derivation

  1. Initial program 36.7

    \[\tan \left(x + \varepsilon\right) - \tan x\]
  2. Initial simplification36.7

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

    \[\leadsto \color{blue}{\frac{\tan \varepsilon + \tan x}{1 - \tan \varepsilon \cdot \tan x}} - \tan x\]
  5. Using strategy rm
  6. Applied add-log-exp21.7

    \[\leadsto \frac{\tan \varepsilon + \tan x}{1 - \color{blue}{\log \left(e^{\tan \varepsilon \cdot \tan x}\right)}} - \tan x\]
  7. Using strategy rm
  8. Applied tan-quot21.8

    \[\leadsto \frac{\tan \varepsilon + \tan x}{1 - \log \left(e^{\tan \varepsilon \cdot \tan x}\right)} - \color{blue}{\frac{\sin x}{\cos x}}\]
  9. Applied frac-sub21.9

    \[\leadsto \color{blue}{\frac{\left(\tan \varepsilon + \tan x\right) \cdot \cos x - \left(1 - \log \left(e^{\tan \varepsilon \cdot \tan x}\right)\right) \cdot \sin x}{\left(1 - \log \left(e^{\tan \varepsilon \cdot \tan x}\right)\right) \cdot \cos x}}\]
  10. Simplified20.5

    \[\leadsto \frac{\color{blue}{\tan x \cdot \left(\sin x \cdot \tan \varepsilon\right) + \left(\cos x \cdot \left(\tan x + \tan \varepsilon\right) - \sin x\right)}}{\left(1 - \log \left(e^{\tan \varepsilon \cdot \tan x}\right)\right) \cdot \cos x}\]
  11. Simplified20.4

    \[\leadsto \frac{\tan x \cdot \left(\sin x \cdot \tan \varepsilon\right) + \left(\cos x \cdot \left(\tan x + \tan \varepsilon\right) - \sin x\right)}{\color{blue}{\cos x - \tan x \cdot \left(\cos x \cdot \tan \varepsilon\right)}}\]
  12. Taylor expanded around -inf 0.4

    \[\leadsto \frac{\tan x \cdot \left(\sin x \cdot \tan \varepsilon\right) + \color{blue}{\frac{\cos x \cdot \sin \varepsilon}{\cos \varepsilon}}}{\cos x - \tan x \cdot \left(\cos x \cdot \tan \varepsilon\right)}\]
  13. Final simplification0.4

    \[\leadsto \frac{\left(\tan \varepsilon \cdot \sin x\right) \cdot \tan x + \frac{\cos x \cdot \sin \varepsilon}{\cos \varepsilon}}{\cos x - \tan x \cdot \left(\cos x \cdot \tan \varepsilon\right)}\]

Runtime

Time bar (total: 42.6s)Debug logProfile

herbie shell --seed 2018277 
(FPCore (x eps)
  :name "2tan (problem 3.3.2)"

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

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