\[\tan \left(x + \varepsilon\right) - \tan x\]
Test:
NMSE problem 3.3.2
Bits:
128 bits
Bits error versus x
Bits error versus eps
Time: 52.8 s
Input Error: 37.6
Output Error: 22.1
Log:
Profile: 🕒
\(\begin{cases} \frac{\cot x \cdot \left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right) - \cos \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right) \cdot \cot x} & \text{when } \varepsilon \le -1.2734516787323002 \cdot 10^{-34} \\ \frac{\varepsilon}{\cos \left(\varepsilon + x\right) \cdot \cot x} \cdot \left(\frac{\cos x}{\frac{\sin x}{\cos x}} + \sin x\right) & \text{when } \varepsilon \le -4.478153436892399 \cdot 10^{-243} \\ \left(\frac{{\varepsilon}^2}{\cos x} \cdot \sin x + \varepsilon\right) + \left(\left(\left(\frac{\sin x}{\cos x} + \frac{{\left(\sin x\right)}^3 \cdot {\varepsilon}^2}{{\left(\cos x\right)}^3}\right) + \frac{\frac{\varepsilon}{\frac{\cos x}{\sin x}}}{\frac{\cos x}{\sin x}}\right) - \tan x\right) & \text{when } \varepsilon \le 3.932045143122947 \cdot 10^{-267} \\ \frac{\varepsilon}{\cos \left(\varepsilon + x\right) \cdot \cot x} \cdot \left(\frac{\cos x}{\frac{\sin x}{\cos x}} + \sin x\right) & \text{when } \varepsilon \le 639.2159073015437 \\ \frac{\cot x \cdot \left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right) - \cos \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right) \cdot \cot x} & \text{otherwise} \end{cases}\)

    if eps < -1.2734516787323002e-34 or 639.2159073015437 < eps

    1. Started with
      \[\tan \left(x + \varepsilon\right) - \tan x\]
      29.8
    2. Using strategy rm
      29.8
    3. Applied tan-cotan to get
      \[\tan \left(x + \varepsilon\right) - \color{red}{\tan x} \leadsto \tan \left(x + \varepsilon\right) - \color{blue}{\frac{1}{\cot x}}\]
      29.8
    4. Applied tan-quot to get
      \[\color{red}{\tan \left(x + \varepsilon\right)} - \frac{1}{\cot x} \leadsto \color{blue}{\frac{\sin \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right)}} - \frac{1}{\cot x}\]
      29.8
    5. Applied frac-sub to get
      \[\color{red}{\frac{\sin \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right)} - \frac{1}{\cot x}} \leadsto \color{blue}{\frac{\sin \left(x + \varepsilon\right) \cdot \cot x - \cos \left(x + \varepsilon\right) \cdot 1}{\cos \left(x + \varepsilon\right) \cdot \cot x}}\]
      29.9
    6. Applied simplify to get
      \[\frac{\color{red}{\sin \left(x + \varepsilon\right) \cdot \cot x - \cos \left(x + \varepsilon\right) \cdot 1}}{\cos \left(x + \varepsilon\right) \cdot \cot x} \leadsto \frac{\color{blue}{\cot x \cdot \sin \left(x + \varepsilon\right) - \cos \left(x + \varepsilon\right)}}{\cos \left(x + \varepsilon\right) \cdot \cot x}\]
      29.9
    7. Using strategy rm
      29.9
    8. Applied sin-sum to get
      \[\frac{\cot x \cdot \color{red}{\sin \left(x + \varepsilon\right)} - \cos \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right) \cdot \cot x} \leadsto \frac{\cot x \cdot \color{blue}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right)} - \cos \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right) \cdot \cot x}\]
      28.0

    if -1.2734516787323002e-34 < eps < -4.478153436892399e-243 or 3.932045143122947e-267 < eps < 639.2159073015437

    1. Started with
      \[\tan \left(x + \varepsilon\right) - \tan x\]
      44.0
    2. Using strategy rm
      44.0
    3. Applied tan-cotan to get
      \[\tan \left(x + \varepsilon\right) - \color{red}{\tan x} \leadsto \tan \left(x + \varepsilon\right) - \color{blue}{\frac{1}{\cot x}}\]
      44.0
    4. Applied tan-quot to get
      \[\color{red}{\tan \left(x + \varepsilon\right)} - \frac{1}{\cot x} \leadsto \color{blue}{\frac{\sin \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right)}} - \frac{1}{\cot x}\]
      44.1
    5. Applied frac-sub to get
      \[\color{red}{\frac{\sin \left(x + \varepsilon\right)}{\cos \left(x + \varepsilon\right)} - \frac{1}{\cot x}} \leadsto \color{blue}{\frac{\sin \left(x + \varepsilon\right) \cdot \cot x - \cos \left(x + \varepsilon\right) \cdot 1}{\cos \left(x + \varepsilon\right) \cdot \cot x}}\]
      44.2
    6. Applied simplify to get
      \[\frac{\color{red}{\sin \left(x + \varepsilon\right) \cdot \cot x - \cos \left(x + \varepsilon\right) \cdot 1}}{\cos \left(x + \varepsilon\right) \cdot \cot x} \leadsto \frac{\color{blue}{\cot x \cdot \sin \left(x + \varepsilon\right) - \cos \left(x + \varepsilon\right)}}{\cos \left(x + \varepsilon\right) \cdot \cot x}\]
      44.2
    7. Using strategy rm
      44.2
    8. Applied add-cbrt-cube to get
      \[\frac{\color{red}{\cot x \cdot \sin \left(x + \varepsilon\right) - \cos \left(x + \varepsilon\right)}}{\cos \left(x + \varepsilon\right) \cdot \cot x} \leadsto \frac{\color{blue}{\sqrt[3]{{\left(\cot x \cdot \sin \left(x + \varepsilon\right) - \cos \left(x + \varepsilon\right)\right)}^3}}}{\cos \left(x + \varepsilon\right) \cdot \cot x}\]
      51.2
    9. Applied taylor to get
      \[\frac{\sqrt[3]{{\left(\cot x \cdot \sin \left(x + \varepsilon\right) - \cos \left(x + \varepsilon\right)\right)}^3}}{\cos \left(x + \varepsilon\right) \cdot \cot x} \leadsto \frac{\varepsilon \cdot \left(\frac{{\left(\cos x\right)}^2}{\sin x} + \sin x\right)}{\cos \left(x + \varepsilon\right) \cdot \cot x}\]
      0.9
    10. Taylor expanded around 0 to get
      \[\frac{\color{red}{\varepsilon \cdot \left(\frac{{\left(\cos x\right)}^2}{\sin x} + \sin x\right)}}{\cos \left(x + \varepsilon\right) \cdot \cot x} \leadsto \frac{\color{blue}{\varepsilon \cdot \left(\frac{{\left(\cos x\right)}^2}{\sin x} + \sin x\right)}}{\cos \left(x + \varepsilon\right) \cdot \cot x}\]
      0.9
    11. Applied simplify to get
      \[\frac{\varepsilon \cdot \left(\frac{{\left(\cos x\right)}^2}{\sin x} + \sin x\right)}{\cos \left(x + \varepsilon\right) \cdot \cot x} \leadsto \frac{\varepsilon}{\cos \left(\varepsilon + x\right) \cdot \cot x} \cdot \left(\frac{\cos x}{\frac{\sin x}{\cos x}} + \sin x\right)\]
      13.1

    12. Applied final simplification

    if -4.478153436892399e-243 < eps < 3.932045143122947e-267

    1. Started with
      \[\tan \left(x + \varepsilon\right) - \tan x\]
      55.7
    2. Using strategy rm
      55.7
    3. Applied add-cbrt-cube to get
      \[\color{red}{\tan \left(x + \varepsilon\right)} - \tan x \leadsto \color{blue}{\sqrt[3]{{\left(\tan \left(x + \varepsilon\right)\right)}^3}} - \tan x\]
      59.9
    4. Applied taylor to get
      \[\sqrt[3]{{\left(\tan \left(x + \varepsilon\right)\right)}^3} - \tan x \leadsto \left(\varepsilon + \left(\frac{{\varepsilon}^2 \cdot \sin x}{\cos x} + \left(\frac{{\varepsilon}^2 \cdot {\left(\sin x\right)}^{3}}{{\left(\cos x\right)}^{3}} + \left(\frac{\varepsilon \cdot {\left(\sin x\right)}^2}{{\left(\cos x\right)}^2} + \frac{\sin x}{\cos x}\right)\right)\right)\right) - \tan x\]
      56.3
    5. Taylor expanded around 0 to get
      \[\color{red}{\left(\varepsilon + \left(\frac{{\varepsilon}^2 \cdot \sin x}{\cos x} + \left(\frac{{\varepsilon}^2 \cdot {\left(\sin x\right)}^{3}}{{\left(\cos x\right)}^{3}} + \left(\frac{\varepsilon \cdot {\left(\sin x\right)}^2}{{\left(\cos x\right)}^2} + \frac{\sin x}{\cos x}\right)\right)\right)\right)} - \tan x \leadsto \color{blue}{\left(\varepsilon + \left(\frac{{\varepsilon}^2 \cdot \sin x}{\cos x} + \left(\frac{{\varepsilon}^2 \cdot {\left(\sin x\right)}^{3}}{{\left(\cos x\right)}^{3}} + \left(\frac{\varepsilon \cdot {\left(\sin x\right)}^2}{{\left(\cos x\right)}^2} + \frac{\sin x}{\cos x}\right)\right)\right)\right)} - \tan x\]
      56.3
    6. Applied simplify to get
      \[\left(\varepsilon + \left(\frac{{\varepsilon}^2 \cdot \sin x}{\cos x} + \left(\frac{{\varepsilon}^2 \cdot {\left(\sin x\right)}^{3}}{{\left(\cos x\right)}^{3}} + \left(\frac{\varepsilon \cdot {\left(\sin x\right)}^2}{{\left(\cos x\right)}^2} + \frac{\sin x}{\cos x}\right)\right)\right)\right) - \tan x \leadsto \left(\frac{{\varepsilon}^2}{\cos x} \cdot \sin x + \varepsilon\right) + \left(\left(\left(\frac{\sin x}{\cos x} + \frac{{\left(\sin x\right)}^3 \cdot {\varepsilon}^2}{{\left(\cos x\right)}^3}\right) + \frac{\frac{\varepsilon}{\frac{\cos x}{\sin x}}}{\frac{\cos x}{\sin x}}\right) - \tan x\right)\]
      26.9

    7. Applied final simplification

  1. Removed slow pow expressions

Original test:


(lambda ((x default) (eps default))
  #:name "NMSE problem 3.3.2"
  (- (tan (+ x eps)) (tan x))
  #:target
  (/ (sin eps) (* (cos x) (cos (+ x eps)))))