\[\sin \left(x + \varepsilon\right) - \sin x\]
Test:
NMSE example 3.3
Bits:
128 bits
Bits error versus x
Bits error versus eps
Time: 10.9 s
Input Error: 16.7
Output Error: 0.3
Log:
Profile: 🕒
\(\begin{cases} {\left(\sin x \cdot \cos \varepsilon\right)}^{1} + \left(\cos x \cdot \sin \varepsilon - \sin x\right) & \text{when } \varepsilon \le -0.1735093f0 \\ \sin \varepsilon \cdot \cos x - \left(\frac{1}{2} \cdot \varepsilon\right) \cdot \left(\sin x \cdot \varepsilon\right) & \text{when } \varepsilon \le 0.058325335f0 \\ {\left(\sin x \cdot \cos \varepsilon\right)}^{1} + \left(\cos x \cdot \sin \varepsilon - \sin x\right) & \text{otherwise} \end{cases}\)

    if eps < -0.1735093f0 or 0.058325335f0 < eps

    1. Started with
      \[\sin \left(x + \varepsilon\right) - \sin x\]
      14.1
    2. Using strategy rm
      14.1
    3. Applied sin-sum to get
      \[\color{red}{\sin \left(x + \varepsilon\right)} - \sin x \leadsto \color{blue}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right)} - \sin x\]
      0.3
    4. Applied associate--l+ to get
      \[\color{red}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right) - \sin x} \leadsto \color{blue}{\sin x \cdot \cos \varepsilon + \left(\cos x \cdot \sin \varepsilon - \sin x\right)}\]
      0.3
    5. Using strategy rm
      0.3
    6. Applied pow1 to get
      \[\sin x \cdot \color{red}{\cos \varepsilon} + \left(\cos x \cdot \sin \varepsilon - \sin x\right) \leadsto \sin x \cdot \color{blue}{{\left(\cos \varepsilon\right)}^{1}} + \left(\cos x \cdot \sin \varepsilon - \sin x\right)\]
      0.3
    7. Applied pow1 to get
      \[\color{red}{\sin x} \cdot {\left(\cos \varepsilon\right)}^{1} + \left(\cos x \cdot \sin \varepsilon - \sin x\right) \leadsto \color{blue}{{\left(\sin x\right)}^{1}} \cdot {\left(\cos \varepsilon\right)}^{1} + \left(\cos x \cdot \sin \varepsilon - \sin x\right)\]
      0.3
    8. Applied pow-prod-down to get
      \[\color{red}{{\left(\sin x\right)}^{1} \cdot {\left(\cos \varepsilon\right)}^{1}} + \left(\cos x \cdot \sin \varepsilon - \sin x\right) \leadsto \color{blue}{{\left(\sin x \cdot \cos \varepsilon\right)}^{1}} + \left(\cos x \cdot \sin \varepsilon - \sin x\right)\]
      0.4

    if -0.1735093f0 < eps < 0.058325335f0

    1. Started with
      \[\sin \left(x + \varepsilon\right) - \sin x\]
      19.5
    2. Using strategy rm
      19.5
    3. Applied sin-sum to get
      \[\color{red}{\sin \left(x + \varepsilon\right)} - \sin x \leadsto \color{blue}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right)} - \sin x\]
      12.5
    4. Applied associate--l+ to get
      \[\color{red}{\left(\sin x \cdot \cos \varepsilon + \cos x \cdot \sin \varepsilon\right) - \sin x} \leadsto \color{blue}{\sin x \cdot \cos \varepsilon + \left(\cos x \cdot \sin \varepsilon - \sin x\right)}\]
      12.5
    5. Using strategy rm
      12.5
    6. Applied add-cube-cbrt to get
      \[\color{red}{\sin x \cdot \cos \varepsilon} + \left(\cos x \cdot \sin \varepsilon - \sin x\right) \leadsto \color{blue}{{\left(\sqrt[3]{\sin x \cdot \cos \varepsilon}\right)}^3} + \left(\cos x \cdot \sin \varepsilon - \sin x\right)\]
      18.8
    7. Applied taylor to get
      \[{\left(\sqrt[3]{\sin x \cdot \cos \varepsilon}\right)}^3 + \left(\cos x \cdot \sin \varepsilon - \sin x\right) \leadsto \left(\sin x - \frac{1}{2} \cdot \left({\varepsilon}^2 \cdot \sin x\right)\right) + \left(\cos x \cdot \sin \varepsilon - \sin x\right)\]
      12.1
    8. Taylor expanded around 0 to get
      \[\color{red}{\left(\sin x - \frac{1}{2} \cdot \left({\varepsilon}^2 \cdot \sin x\right)\right)} + \left(\cos x \cdot \sin \varepsilon - \sin x\right) \leadsto \color{blue}{\left(\sin x - \frac{1}{2} \cdot \left({\varepsilon}^2 \cdot \sin x\right)\right)} + \left(\cos x \cdot \sin \varepsilon - \sin x\right)\]
      12.1
    9. Applied simplify to get
      \[\left(\sin x - \frac{1}{2} \cdot \left({\varepsilon}^2 \cdot \sin x\right)\right) + \left(\cos x \cdot \sin \varepsilon - \sin x\right) \leadsto \left(\cos x \cdot \sin \varepsilon - \left(\sin x - \sin x\right)\right) - \sin x \cdot \left(\left(\varepsilon \cdot \varepsilon\right) \cdot \frac{1}{2}\right)\]
      0.1

    10. Applied final simplification
    11. Applied simplify to get
      \[\color{red}{\left(\cos x \cdot \sin \varepsilon - \left(\sin x - \sin x\right)\right) - \sin x \cdot \left(\left(\varepsilon \cdot \varepsilon\right) \cdot \frac{1}{2}\right)} \leadsto \color{blue}{\sin \varepsilon \cdot \cos x - \left(\frac{1}{2} \cdot \varepsilon\right) \cdot \left(\sin x \cdot \varepsilon\right)}\]
      0.1

  1. Removed slow pow expressions

Original test:


(lambda ((x default) (eps default))
  #:name "NMSE example 3.3"
  (- (sin (+ x eps)) (sin x))
  #:target
  (* 2 (* (cos (+ x (/ eps 2))) (sin (/ eps 2)))))