Average Error: 1.2 → 0.3
Time: 16.4s
Precision: binary64
\[\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)\]
↓
\[\frac{\frac{\cos^{-1} \left(\sqrt{t} \cdot \frac{0.05555555555555555 \cdot \frac{x}{y}}{z}\right)}{\sqrt{3}}}{\sqrt{3}}\]
\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)
↓
\frac{\frac{\cos^{-1} \left(\sqrt{t} \cdot \frac{0.05555555555555555 \cdot \frac{x}{y}}{z}\right)}{\sqrt{3}}}{\sqrt{3}}
(FPCore (x y z t)
 :precision binary64
 (* (/ 1.0 3.0) (acos (* (/ (* 3.0 (/ x (* y 27.0))) (* z 2.0)) (sqrt t)))))
↓
(FPCore (x y z t)
 :precision binary64
 (/
  (/ (acos (* (sqrt t) (/ (* 0.05555555555555555 (/ x y)) z))) (sqrt 3.0))
  (sqrt 3.0)))
double code(double x, double y, double z, double t) {
	return (1.0 / 3.0) * acos(((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t));
}
↓
double code(double x, double y, double z, double t) {
	return (acos(sqrt(t) * ((0.05555555555555555 * (x / y)) / z)) / sqrt(3.0)) / sqrt(3.0);
}

Error

Bits error versus x

Bits error versus y

Bits error versus z

Bits error versus t

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Target

Original1.2
Target1.2
Herbie0.3
\[\frac{\cos^{-1} \left(\frac{\frac{x}{27}}{y \cdot z} \cdot \frac{\sqrt{t}}{\frac{2}{3}}\right)}{3}\]

Derivation

  1. Initial program 1.2

    \[\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)\]
  2. Using strategy rm

  3. Applied add-sqr-sqrt_binary64_178320.3

    \[\leadsto \frac{1}{\color{blue}{\sqrt{3} \cdot \sqrt{3}}} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)\]

  4. Applied *-un-lft-identity_binary64_178100.3

    \[\leadsto \frac{\color{blue}{1 \cdot 1}}{\sqrt{3} \cdot \sqrt{3}} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)\]

  5. Applied times-frac_binary64_178161.3

    \[\leadsto \color{blue}{\left(\frac{1}{\sqrt{3}} \cdot \frac{1}{\sqrt{3}}\right)} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)\]

  6. Applied associate-*l*_binary64_177511.3

    \[\leadsto \color{blue}{\frac{1}{\sqrt{3}} \cdot \left(\frac{1}{\sqrt{3}} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)\right)}\]

  7. Simplified0.3

    \[\leadsto \frac{1}{\sqrt{3}} \cdot \color{blue}{\frac{\cos^{-1} \left(\sqrt{t} \cdot \left(1.5 \cdot \frac{\frac{x}{y \cdot 27}}{z}\right)\right)}{\sqrt{3}}}\]
  8. Using strategy rm

  9. Applied associate-*l/_binary64_177530.3

    \[\leadsto \color{blue}{\frac{1 \cdot \frac{\cos^{-1} \left(\sqrt{t} \cdot \left(1.5 \cdot \frac{\frac{x}{y \cdot 27}}{z}\right)\right)}{\sqrt{3}}}{\sqrt{3}}}\]

  10. Simplified0.3

    \[\leadsto \frac{\color{blue}{\frac{\cos^{-1} \left(\sqrt{t} \cdot \frac{0.05555555555555555 \cdot \frac{x}{y}}{z}\right)}{\sqrt{3}}}}{\sqrt{3}}\]

  11. Final simplification0.3

    \[\leadsto \frac{\frac{\cos^{-1} \left(\sqrt{t} \cdot \frac{0.05555555555555555 \cdot \frac{x}{y}}{z}\right)}{\sqrt{3}}}{\sqrt{3}}\]

Reproduce

herbie shell --seed 2021023 
(FPCore (x y z t)
  :name "Diagrams.Solve.Polynomial:cubForm  from diagrams-solve-0.1, D"
  :precision binary64

  :herbie-target
  (/ (acos (* (/ (/ x 27.0) (* y z)) (/ (sqrt t) (/ 2.0 3.0)))) 3.0)

  (* (/ 1.0 3.0) (acos (* (/ (* 3.0 (/ x (* y 27.0))) (* z 2.0)) (sqrt t)))))