Average Error: 37.0 → 0.4
Time: 45.2s
Precision: 64
Internal Precision: 2368
\[\sin \left(x + \varepsilon\right) - \sin x\]
\[\left(\left(\cos \left(\varepsilon \cdot \frac{1}{2}\right) \cdot \cos x - \log \left(e^{\sin \left(\varepsilon \cdot \frac{1}{2}\right) \cdot \sin x}\right)\right) \cdot \sin \left(\frac{\varepsilon}{2}\right)\right) \cdot 2\]

Error

Bits error versus x

Bits error versus eps

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Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original37.0
Target15.3
Herbie0.4
\[2 \cdot \left(\cos \left(x + \frac{\varepsilon}{2}\right) \cdot \sin \left(\frac{\varepsilon}{2}\right)\right)\]

Derivation

  1. Initial program 37.0

    \[\sin \left(x + \varepsilon\right) - \sin x\]
  2. Using strategy rm
  3. Applied diff-sin37.3

    \[\leadsto \color{blue}{2 \cdot \left(\sin \left(\frac{\left(x + \varepsilon\right) - x}{2}\right) \cdot \cos \left(\frac{\left(x + \varepsilon\right) + x}{2}\right)\right)}\]
  4. Applied simplify15.4

    \[\leadsto 2 \cdot \color{blue}{\left(\sin \left(\frac{\varepsilon}{2}\right) \cdot \cos \left(\frac{x + \left(\varepsilon + x\right)}{2}\right)\right)}\]
  5. Taylor expanded around 0 15.3

    \[\leadsto 2 \cdot \left(\sin \left(\frac{\varepsilon}{2}\right) \cdot \cos \color{blue}{\left(\frac{1}{2} \cdot \varepsilon + x\right)}\right)\]
  6. Applied simplify15.3

    \[\leadsto \color{blue}{\left(\cos \left((\varepsilon \cdot \frac{1}{2} + x)_*\right) \cdot \sin \left(\frac{\varepsilon}{2}\right)\right) \cdot 2}\]
  7. Using strategy rm
  8. Applied fma-udef15.3

    \[\leadsto \left(\cos \color{blue}{\left(\varepsilon \cdot \frac{1}{2} + x\right)} \cdot \sin \left(\frac{\varepsilon}{2}\right)\right) \cdot 2\]
  9. Applied cos-sum0.3

    \[\leadsto \left(\color{blue}{\left(\cos \left(\varepsilon \cdot \frac{1}{2}\right) \cdot \cos x - \sin \left(\varepsilon \cdot \frac{1}{2}\right) \cdot \sin x\right)} \cdot \sin \left(\frac{\varepsilon}{2}\right)\right) \cdot 2\]
  10. Using strategy rm
  11. Applied add-log-exp0.4

    \[\leadsto \left(\left(\cos \left(\varepsilon \cdot \frac{1}{2}\right) \cdot \cos x - \color{blue}{\log \left(e^{\sin \left(\varepsilon \cdot \frac{1}{2}\right) \cdot \sin x}\right)}\right) \cdot \sin \left(\frac{\varepsilon}{2}\right)\right) \cdot 2\]

Runtime

Time bar (total: 45.2s)Debug logProfile

herbie shell --seed 2018199 +o rules:numerics
(FPCore (x eps)
  :name "2sin (example 3.3)"

  :herbie-target
  (* 2 (* (cos (+ x (/ eps 2))) (sin (/ eps 2))))

  (- (sin (+ x eps)) (sin x)))