Diagrams.Solve.Polynomial:cubForm from diagrams-solve-0.1, D

Percentage Accurate: 97.9% → 99.7%
Time: 9.4s
Alternatives: 4
Speedup: 1.0×

Specification

?
\[\begin{array}{l} \\ \frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \end{array} \]
(FPCore (x y z t)
 :precision binary64
 (* (/ 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 (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t)));
}
real(8) function code(x, y, z, t)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8), intent (in) :: t
    code = (1.0d0 / 3.0d0) * acos((((3.0d0 * (x / (y * 27.0d0))) / (z * 2.0d0)) * sqrt(t)))
end function
public static double code(double x, double y, double z, double t) {
	return (1.0 / 3.0) * Math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * Math.sqrt(t)));
}
def code(x, y, z, t):
	return (1.0 / 3.0) * math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * math.sqrt(t)))
function code(x, y, z, t)
	return Float64(Float64(1.0 / 3.0) * acos(Float64(Float64(Float64(3.0 * Float64(x / Float64(y * 27.0))) / Float64(z * 2.0)) * sqrt(t))))
end
function tmp = code(x, y, z, t)
	tmp = (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t)));
end
code[x_, y_, z_, t_] := N[(N[(1.0 / 3.0), $MachinePrecision] * N[ArcCos[N[(N[(N[(3.0 * N[(x / N[(y * 27.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[(z * 2.0), $MachinePrecision]), $MachinePrecision] * N[Sqrt[t], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}

\\
\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)
\end{array}

Sampling outcomes in binary64 precision:

Local Percentage Accuracy vs ?

The average percentage accuracy by input value. Horizontal axis shows value of an input variable; the variable is choosen in the title. Vertical axis is accuracy; higher is better. Red represent the original program, while blue represents Herbie's suggestion. These can be toggled with buttons below the plot. The line is an average while dots represent individual samples.

Accuracy vs Speed?

Herbie found 4 alternatives:

AlternativeAccuracySpeedup
The accuracy (vertical axis) and speed (horizontal axis) of each alternatives. Up and to the right is better. The red square shows the initial program, and each blue circle shows an alternative.The line shows the best available speed-accuracy tradeoffs.

Initial Program: 97.9% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \end{array} \]
(FPCore (x y z t)
 :precision binary64
 (* (/ 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 (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t)));
}
real(8) function code(x, y, z, t)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8), intent (in) :: t
    code = (1.0d0 / 3.0d0) * acos((((3.0d0 * (x / (y * 27.0d0))) / (z * 2.0d0)) * sqrt(t)))
end function
public static double code(double x, double y, double z, double t) {
	return (1.0 / 3.0) * Math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * Math.sqrt(t)));
}
def code(x, y, z, t):
	return (1.0 / 3.0) * math.acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * math.sqrt(t)))
function code(x, y, z, t)
	return Float64(Float64(1.0 / 3.0) * acos(Float64(Float64(Float64(3.0 * Float64(x / Float64(y * 27.0))) / Float64(z * 2.0)) * sqrt(t))))
end
function tmp = code(x, y, z, t)
	tmp = (1.0 / 3.0) * acos((((3.0 * (x / (y * 27.0))) / (z * 2.0)) * sqrt(t)));
end
code[x_, y_, z_, t_] := N[(N[(1.0 / 3.0), $MachinePrecision] * N[ArcCos[N[(N[(N[(3.0 * N[(x / N[(y * 27.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision] / N[(z * 2.0), $MachinePrecision]), $MachinePrecision] * N[Sqrt[t], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}

\\
\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right)
\end{array}

Alternative 1: 99.7% accurate, 0.5× speedup?

\[\begin{array}{l} \\ e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\frac{\sqrt{t}}{\frac{z \cdot \left(18 \cdot y\right)}{x}}\right)\right)} + -1 \end{array} \]
(FPCore (x y z t)
 :precision binary64
 (+
  (exp
   (log1p (* 0.3333333333333333 (acos (/ (sqrt t) (/ (* z (* 18.0 y)) x))))))
  -1.0))
double code(double x, double y, double z, double t) {
	return exp(log1p((0.3333333333333333 * acos((sqrt(t) / ((z * (18.0 * y)) / x)))))) + -1.0;
}
public static double code(double x, double y, double z, double t) {
	return Math.exp(Math.log1p((0.3333333333333333 * Math.acos((Math.sqrt(t) / ((z * (18.0 * y)) / x)))))) + -1.0;
}
def code(x, y, z, t):
	return math.exp(math.log1p((0.3333333333333333 * math.acos((math.sqrt(t) / ((z * (18.0 * y)) / x)))))) + -1.0
function code(x, y, z, t)
	return Float64(exp(log1p(Float64(0.3333333333333333 * acos(Float64(sqrt(t) / Float64(Float64(z * Float64(18.0 * y)) / x)))))) + -1.0)
end
code[x_, y_, z_, t_] := N[(N[Exp[N[Log[1 + N[(0.3333333333333333 * N[ArcCos[N[(N[Sqrt[t], $MachinePrecision] / N[(N[(z * N[(18.0 * y), $MachinePrecision]), $MachinePrecision] / x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]], $MachinePrecision] + -1.0), $MachinePrecision]
\begin{array}{l}

\\
e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\frac{\sqrt{t}}{\frac{z \cdot \left(18 \cdot y\right)}{x}}\right)\right)} + -1
\end{array}
Derivation
  1. Initial program 97.7%

    \[\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \]
  2. Simplified97.7%

    \[\leadsto \color{blue}{0.3333333333333333 \cdot \cos^{-1} \left(\left(\frac{3}{z} \cdot \frac{\frac{x}{y}}{54}\right) \cdot \sqrt{t}\right)} \]
  3. Step-by-step derivation
    1. expm1-log1p-u97.7%

      \[\leadsto \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\left(\frac{3}{z} \cdot \frac{\frac{x}{y}}{54}\right) \cdot \sqrt{t}\right)\right)\right)} \]
    2. expm1-udef99.2%

      \[\leadsto \color{blue}{e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\left(\frac{3}{z} \cdot \frac{\frac{x}{y}}{54}\right) \cdot \sqrt{t}\right)\right)} - 1} \]
  4. Applied egg-rr100.0%

    \[\leadsto \color{blue}{e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \frac{x}{\left(z \cdot 0.3333333333333333\right) \cdot \left(y \cdot 54\right)}\right)\right)} - 1} \]
  5. Step-by-step derivation
    1. clear-num100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \color{blue}{\frac{1}{\frac{\left(z \cdot 0.3333333333333333\right) \cdot \left(y \cdot 54\right)}{x}}}\right)\right)} - 1 \]
    2. un-div-inv100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\frac{\sqrt{t}}{\frac{\left(z \cdot 0.3333333333333333\right) \cdot \left(y \cdot 54\right)}{x}}\right)}\right)} - 1 \]
    3. associate-*l*100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\frac{\sqrt{t}}{\frac{\color{blue}{z \cdot \left(0.3333333333333333 \cdot \left(y \cdot 54\right)\right)}}{x}}\right)\right)} - 1 \]
    4. *-commutative100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\frac{\sqrt{t}}{\frac{z \cdot \left(0.3333333333333333 \cdot \color{blue}{\left(54 \cdot y\right)}\right)}{x}}\right)\right)} - 1 \]
    5. associate-*r*100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\frac{\sqrt{t}}{\frac{z \cdot \color{blue}{\left(\left(0.3333333333333333 \cdot 54\right) \cdot y\right)}}{x}}\right)\right)} - 1 \]
    6. metadata-eval100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\frac{\sqrt{t}}{\frac{z \cdot \left(\color{blue}{18} \cdot y\right)}{x}}\right)\right)} - 1 \]
  6. Applied egg-rr100.0%

    \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\frac{\sqrt{t}}{\frac{z \cdot \left(18 \cdot y\right)}{x}}\right)}\right)} - 1 \]
  7. Final simplification100.0%

    \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\frac{\sqrt{t}}{\frac{z \cdot \left(18 \cdot y\right)}{x}}\right)\right)} + -1 \]

Alternative 2: 98.5% accurate, 0.5× speedup?

\[\begin{array}{l} \\ e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(0.05555555555555555 \cdot \frac{\sqrt{t} \cdot x}{z \cdot y}\right)\right)} + -1 \end{array} \]
(FPCore (x y z t)
 :precision binary64
 (+
  (exp
   (log1p
    (*
     0.3333333333333333
     (acos (* 0.05555555555555555 (/ (* (sqrt t) x) (* z y)))))))
  -1.0))
double code(double x, double y, double z, double t) {
	return exp(log1p((0.3333333333333333 * acos((0.05555555555555555 * ((sqrt(t) * x) / (z * y))))))) + -1.0;
}
public static double code(double x, double y, double z, double t) {
	return Math.exp(Math.log1p((0.3333333333333333 * Math.acos((0.05555555555555555 * ((Math.sqrt(t) * x) / (z * y))))))) + -1.0;
}
def code(x, y, z, t):
	return math.exp(math.log1p((0.3333333333333333 * math.acos((0.05555555555555555 * ((math.sqrt(t) * x) / (z * y))))))) + -1.0
function code(x, y, z, t)
	return Float64(exp(log1p(Float64(0.3333333333333333 * acos(Float64(0.05555555555555555 * Float64(Float64(sqrt(t) * x) / Float64(z * y))))))) + -1.0)
end
code[x_, y_, z_, t_] := N[(N[Exp[N[Log[1 + N[(0.3333333333333333 * N[ArcCos[N[(0.05555555555555555 * N[(N[(N[Sqrt[t], $MachinePrecision] * x), $MachinePrecision] / N[(z * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]], $MachinePrecision] + -1.0), $MachinePrecision]
\begin{array}{l}

\\
e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(0.05555555555555555 \cdot \frac{\sqrt{t} \cdot x}{z \cdot y}\right)\right)} + -1
\end{array}
Derivation
  1. Initial program 97.7%

    \[\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \]
  2. Step-by-step derivation
    1. metadata-eval97.7%

      \[\leadsto \color{blue}{0.3333333333333333} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \]
    2. *-commutative97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{\color{blue}{2 \cdot z}} \cdot \sqrt{t}\right) \]
    3. times-frac97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\left(\frac{3}{2} \cdot \frac{\frac{x}{y \cdot 27}}{z}\right)} \cdot \sqrt{t}\right) \]
    4. associate-*l*97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\frac{3}{2} \cdot \left(\frac{\frac{x}{y \cdot 27}}{z} \cdot \sqrt{t}\right)\right)} \]
    5. associate-/l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\color{blue}{\frac{x}{z \cdot \left(y \cdot 27\right)}} \cdot \sqrt{t}\right)\right) \]
    6. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{z \cdot \color{blue}{\left(27 \cdot y\right)}} \cdot \sqrt{t}\right)\right) \]
    7. associate-*r*98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{\color{blue}{\left(z \cdot 27\right) \cdot y}} \cdot \sqrt{t}\right)\right) \]
    8. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{\color{blue}{y \cdot \left(z \cdot 27\right)}} \cdot \sqrt{t}\right)\right) \]
    9. associate-/l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\color{blue}{\frac{\frac{x}{z \cdot 27}}{y}} \cdot \sqrt{t}\right)\right) \]
    10. associate-*l*98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\left(\frac{3}{2} \cdot \frac{\frac{x}{z \cdot 27}}{y}\right) \cdot \sqrt{t}\right)} \]
    11. times-frac98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\frac{3 \cdot \frac{x}{z \cdot 27}}{2 \cdot y}} \cdot \sqrt{t}\right) \]
    12. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{z \cdot 27}}{\color{blue}{y \cdot 2}} \cdot \sqrt{t}\right) \]
  3. Simplified98.5%

    \[\leadsto \color{blue}{0.3333333333333333 \cdot \cos^{-1} \left(\left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right) \cdot \sqrt{t}\right)} \]
  4. Step-by-step derivation
    1. expm1-log1p-u98.5%

      \[\leadsto \color{blue}{\mathsf{expm1}\left(\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right) \cdot \sqrt{t}\right)\right)\right)} \]
    2. expm1-udef100.0%

      \[\leadsto \color{blue}{e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(\left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right) \cdot \sqrt{t}\right)\right)} - 1} \]
    3. associate-*l*100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(0.05555555555555555 \cdot \left(\frac{\frac{x}{z}}{y} \cdot \sqrt{t}\right)\right)}\right)} - 1 \]
    4. associate-/l/100.0%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(0.05555555555555555 \cdot \left(\color{blue}{\frac{x}{y \cdot z}} \cdot \sqrt{t}\right)\right)\right)} - 1 \]
    5. associate-*l/99.6%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(0.05555555555555555 \cdot \color{blue}{\frac{x \cdot \sqrt{t}}{y \cdot z}}\right)\right)} - 1 \]
    6. *-commutative99.6%

      \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(0.05555555555555555 \cdot \frac{x \cdot \sqrt{t}}{\color{blue}{z \cdot y}}\right)\right)} - 1 \]
  5. Applied egg-rr99.6%

    \[\leadsto \color{blue}{e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(0.05555555555555555 \cdot \frac{x \cdot \sqrt{t}}{z \cdot y}\right)\right)} - 1} \]
  6. Final simplification99.6%

    \[\leadsto e^{\mathsf{log1p}\left(0.3333333333333333 \cdot \cos^{-1} \left(0.05555555555555555 \cdot \frac{\sqrt{t} \cdot x}{z \cdot y}\right)\right)} + -1 \]

Alternative 3: 98.0% accurate, 1.0× speedup?

\[\begin{array}{l} \\ 0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right)\right) \end{array} \]
(FPCore (x y z t)
 :precision binary64
 (*
  0.3333333333333333
  (acos (* (sqrt t) (* 0.05555555555555555 (/ (/ x z) y))))))
double code(double x, double y, double z, double t) {
	return 0.3333333333333333 * acos((sqrt(t) * (0.05555555555555555 * ((x / z) / y))));
}
real(8) function code(x, y, z, t)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8), intent (in) :: t
    code = 0.3333333333333333d0 * acos((sqrt(t) * (0.05555555555555555d0 * ((x / z) / y))))
end function
public static double code(double x, double y, double z, double t) {
	return 0.3333333333333333 * Math.acos((Math.sqrt(t) * (0.05555555555555555 * ((x / z) / y))));
}
def code(x, y, z, t):
	return 0.3333333333333333 * math.acos((math.sqrt(t) * (0.05555555555555555 * ((x / z) / y))))
function code(x, y, z, t)
	return Float64(0.3333333333333333 * acos(Float64(sqrt(t) * Float64(0.05555555555555555 * Float64(Float64(x / z) / y)))))
end
function tmp = code(x, y, z, t)
	tmp = 0.3333333333333333 * acos((sqrt(t) * (0.05555555555555555 * ((x / z) / y))));
end
code[x_, y_, z_, t_] := N[(0.3333333333333333 * N[ArcCos[N[(N[Sqrt[t], $MachinePrecision] * N[(0.05555555555555555 * N[(N[(x / z), $MachinePrecision] / y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}

\\
0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right)\right)
\end{array}
Derivation
  1. Initial program 97.7%

    \[\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \]
  2. Step-by-step derivation
    1. metadata-eval97.7%

      \[\leadsto \color{blue}{0.3333333333333333} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \]
    2. *-commutative97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{\color{blue}{2 \cdot z}} \cdot \sqrt{t}\right) \]
    3. times-frac97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\left(\frac{3}{2} \cdot \frac{\frac{x}{y \cdot 27}}{z}\right)} \cdot \sqrt{t}\right) \]
    4. associate-*l*97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\frac{3}{2} \cdot \left(\frac{\frac{x}{y \cdot 27}}{z} \cdot \sqrt{t}\right)\right)} \]
    5. associate-/l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\color{blue}{\frac{x}{z \cdot \left(y \cdot 27\right)}} \cdot \sqrt{t}\right)\right) \]
    6. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{z \cdot \color{blue}{\left(27 \cdot y\right)}} \cdot \sqrt{t}\right)\right) \]
    7. associate-*r*98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{\color{blue}{\left(z \cdot 27\right) \cdot y}} \cdot \sqrt{t}\right)\right) \]
    8. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{\color{blue}{y \cdot \left(z \cdot 27\right)}} \cdot \sqrt{t}\right)\right) \]
    9. associate-/l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\color{blue}{\frac{\frac{x}{z \cdot 27}}{y}} \cdot \sqrt{t}\right)\right) \]
    10. associate-*l*98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\left(\frac{3}{2} \cdot \frac{\frac{x}{z \cdot 27}}{y}\right) \cdot \sqrt{t}\right)} \]
    11. times-frac98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\frac{3 \cdot \frac{x}{z \cdot 27}}{2 \cdot y}} \cdot \sqrt{t}\right) \]
    12. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{z \cdot 27}}{\color{blue}{y \cdot 2}} \cdot \sqrt{t}\right) \]
  3. Simplified98.5%

    \[\leadsto \color{blue}{0.3333333333333333 \cdot \cos^{-1} \left(\left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right) \cdot \sqrt{t}\right)} \]
  4. Final simplification98.5%

    \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right)\right) \]

Alternative 4: 98.2% accurate, 1.0× speedup?

\[\begin{array}{l} \\ 0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \frac{x \cdot 0.05555555555555555}{z \cdot y}\right) \end{array} \]
(FPCore (x y z t)
 :precision binary64
 (*
  0.3333333333333333
  (acos (* (sqrt t) (/ (* x 0.05555555555555555) (* z y))))))
double code(double x, double y, double z, double t) {
	return 0.3333333333333333 * acos((sqrt(t) * ((x * 0.05555555555555555) / (z * y))));
}
real(8) function code(x, y, z, t)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8), intent (in) :: t
    code = 0.3333333333333333d0 * acos((sqrt(t) * ((x * 0.05555555555555555d0) / (z * y))))
end function
public static double code(double x, double y, double z, double t) {
	return 0.3333333333333333 * Math.acos((Math.sqrt(t) * ((x * 0.05555555555555555) / (z * y))));
}
def code(x, y, z, t):
	return 0.3333333333333333 * math.acos((math.sqrt(t) * ((x * 0.05555555555555555) / (z * y))))
function code(x, y, z, t)
	return Float64(0.3333333333333333 * acos(Float64(sqrt(t) * Float64(Float64(x * 0.05555555555555555) / Float64(z * y)))))
end
function tmp = code(x, y, z, t)
	tmp = 0.3333333333333333 * acos((sqrt(t) * ((x * 0.05555555555555555) / (z * y))));
end
code[x_, y_, z_, t_] := N[(0.3333333333333333 * N[ArcCos[N[(N[Sqrt[t], $MachinePrecision] * N[(N[(x * 0.05555555555555555), $MachinePrecision] / N[(z * y), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]
\begin{array}{l}

\\
0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \frac{x \cdot 0.05555555555555555}{z \cdot y}\right)
\end{array}
Derivation
  1. Initial program 97.7%

    \[\frac{1}{3} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \]
  2. Step-by-step derivation
    1. metadata-eval97.7%

      \[\leadsto \color{blue}{0.3333333333333333} \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{z \cdot 2} \cdot \sqrt{t}\right) \]
    2. *-commutative97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{y \cdot 27}}{\color{blue}{2 \cdot z}} \cdot \sqrt{t}\right) \]
    3. times-frac97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\left(\frac{3}{2} \cdot \frac{\frac{x}{y \cdot 27}}{z}\right)} \cdot \sqrt{t}\right) \]
    4. associate-*l*97.7%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\frac{3}{2} \cdot \left(\frac{\frac{x}{y \cdot 27}}{z} \cdot \sqrt{t}\right)\right)} \]
    5. associate-/l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\color{blue}{\frac{x}{z \cdot \left(y \cdot 27\right)}} \cdot \sqrt{t}\right)\right) \]
    6. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{z \cdot \color{blue}{\left(27 \cdot y\right)}} \cdot \sqrt{t}\right)\right) \]
    7. associate-*r*98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{\color{blue}{\left(z \cdot 27\right) \cdot y}} \cdot \sqrt{t}\right)\right) \]
    8. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\frac{x}{\color{blue}{y \cdot \left(z \cdot 27\right)}} \cdot \sqrt{t}\right)\right) \]
    9. associate-/l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3}{2} \cdot \left(\color{blue}{\frac{\frac{x}{z \cdot 27}}{y}} \cdot \sqrt{t}\right)\right) \]
    10. associate-*l*98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \color{blue}{\left(\left(\frac{3}{2} \cdot \frac{\frac{x}{z \cdot 27}}{y}\right) \cdot \sqrt{t}\right)} \]
    11. times-frac98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\frac{3 \cdot \frac{x}{z \cdot 27}}{2 \cdot y}} \cdot \sqrt{t}\right) \]
    12. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{3 \cdot \frac{x}{z \cdot 27}}{\color{blue}{y \cdot 2}} \cdot \sqrt{t}\right) \]
  3. Simplified98.5%

    \[\leadsto \color{blue}{0.3333333333333333 \cdot \cos^{-1} \left(\left(0.05555555555555555 \cdot \frac{\frac{x}{z}}{y}\right) \cdot \sqrt{t}\right)} \]
  4. Step-by-step derivation
    1. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\left(\frac{\frac{x}{z}}{y} \cdot 0.05555555555555555\right)} \cdot \sqrt{t}\right) \]
    2. associate-/l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\left(\color{blue}{\frac{x}{y \cdot z}} \cdot 0.05555555555555555\right) \cdot \sqrt{t}\right) \]
    3. associate-*l/98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\frac{x \cdot 0.05555555555555555}{y \cdot z}} \cdot \sqrt{t}\right) \]
    4. *-commutative98.5%

      \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\frac{x \cdot 0.05555555555555555}{\color{blue}{z \cdot y}} \cdot \sqrt{t}\right) \]
  5. Applied egg-rr98.5%

    \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\color{blue}{\frac{x \cdot 0.05555555555555555}{z \cdot y}} \cdot \sqrt{t}\right) \]
  6. Final simplification98.5%

    \[\leadsto 0.3333333333333333 \cdot \cos^{-1} \left(\sqrt{t} \cdot \frac{x \cdot 0.05555555555555555}{z \cdot y}\right) \]

Developer target: 98.2% accurate, 1.0× speedup?

\[\begin{array}{l} \\ \frac{\cos^{-1} \left(\frac{\frac{x}{27}}{y \cdot z} \cdot \frac{\sqrt{t}}{\frac{2}{3}}\right)}{3} \end{array} \]
(FPCore (x y z t)
 :precision binary64
 (/ (acos (* (/ (/ x 27.0) (* y z)) (/ (sqrt t) (/ 2.0 3.0)))) 3.0))
double code(double x, double y, double z, double t) {
	return acos((((x / 27.0) / (y * z)) * (sqrt(t) / (2.0 / 3.0)))) / 3.0;
}
real(8) function code(x, y, z, t)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8), intent (in) :: t
    code = acos((((x / 27.0d0) / (y * z)) * (sqrt(t) / (2.0d0 / 3.0d0)))) / 3.0d0
end function
public static double code(double x, double y, double z, double t) {
	return Math.acos((((x / 27.0) / (y * z)) * (Math.sqrt(t) / (2.0 / 3.0)))) / 3.0;
}
def code(x, y, z, t):
	return math.acos((((x / 27.0) / (y * z)) * (math.sqrt(t) / (2.0 / 3.0)))) / 3.0
function code(x, y, z, t)
	return Float64(acos(Float64(Float64(Float64(x / 27.0) / Float64(y * z)) * Float64(sqrt(t) / Float64(2.0 / 3.0)))) / 3.0)
end
function tmp = code(x, y, z, t)
	tmp = acos((((x / 27.0) / (y * z)) * (sqrt(t) / (2.0 / 3.0)))) / 3.0;
end
code[x_, y_, z_, t_] := N[(N[ArcCos[N[(N[(N[(x / 27.0), $MachinePrecision] / N[(y * z), $MachinePrecision]), $MachinePrecision] * N[(N[Sqrt[t], $MachinePrecision] / N[(2.0 / 3.0), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / 3.0), $MachinePrecision]
\begin{array}{l}

\\
\frac{\cos^{-1} \left(\frac{\frac{x}{27}}{y \cdot z} \cdot \frac{\sqrt{t}}{\frac{2}{3}}\right)}{3}
\end{array}

Reproduce

?
herbie shell --seed 2023298 
(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)))))