Average Error: 47.4 → 13.1
Time: 24.7s
Precision: binary64
\[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)} \]
↓
\[2 \cdot \frac{\ell \cdot \left(\frac{\cos k}{k} \cdot \ell\right)}{k \cdot \left(t \cdot {\sin k}^{2}\right)} \]
\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)}
↓
2 \cdot \frac{\ell \cdot \left(\frac{\cos k}{k} \cdot \ell\right)}{k \cdot \left(t \cdot {\sin k}^{2}\right)}

(FPCore (t l k)
 :precision binary64
 (/
  2.0
  (*
   (* (* (/ (pow t 3.0) (* l l)) (sin k)) (tan k))
   (- (+ 1.0 (pow (/ k t) 2.0)) 1.0))))
↓
(FPCore (t l k)
 :precision binary64
 (* 2.0 (/ (* l (* (/ (cos k) k) l)) (* k (* t (pow (sin k) 2.0))))))
double code(double t, double l, double k) {
	return 2.0 / ((((pow(t, 3.0) / (l * l)) * sin(k)) * tan(k)) * ((1.0 + pow((k / t), 2.0)) - 1.0));
}
↓
double code(double t, double l, double k) {
	return 2.0 * ((l * ((cos(k) / k) * l)) / (k * (t * pow(sin(k), 2.0))));
}

Error

Bits error versus t

Bits error versus l

Bits error versus k

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 47.4

    \[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) - 1\right)} \]

  2. Simplified39.7

    \[\leadsto \color{blue}{\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot {\left(\frac{k}{t}\right)}^{2}}} \]

  3. Taylor expanded in t around 0 22.5

    \[\leadsto \color{blue}{2 \cdot \frac{\cos k \cdot {\ell}^{2}}{{k}^{2} \cdot \left(t \cdot {\sin k}^{2}\right)}} \]

  4. Applied unpow2_binary6422.5

    \[\leadsto 2 \cdot \frac{\cos k \cdot {\ell}^{2}}{\color{blue}{\left(k \cdot k\right)} \cdot \left(t \cdot {\sin k}^{2}\right)} \]

  5. Applied associate-*l*_binary6420.4

    \[\leadsto 2 \cdot \frac{\cos k \cdot {\ell}^{2}}{\color{blue}{k \cdot \left(k \cdot \left(t \cdot {\sin k}^{2}\right)\right)}} \]

  6. Applied associate-/r*_binary6418.4

    \[\leadsto 2 \cdot \color{blue}{\frac{\frac{\cos k \cdot {\ell}^{2}}{k}}{k \cdot \left(t \cdot {\sin k}^{2}\right)}} \]

  7. Simplified18.4

    \[\leadsto 2 \cdot \frac{\color{blue}{\frac{\cos k}{k} \cdot \left(\ell \cdot \ell\right)}}{k \cdot \left(t \cdot {\sin k}^{2}\right)} \]

  8. Applied associate-*r*_binary6413.1

    \[\leadsto 2 \cdot \frac{\color{blue}{\left(\frac{\cos k}{k} \cdot \ell\right) \cdot \ell}}{k \cdot \left(t \cdot {\sin k}^{2}\right)} \]

  9. Final simplification13.1

    \[\leadsto 2 \cdot \frac{\ell \cdot \left(\frac{\cos k}{k} \cdot \ell\right)}{k \cdot \left(t \cdot {\sin k}^{2}\right)} \]

Reproduce

herbie shell --seed 2021340 
(FPCore (t l k)
  :name "Toniolo and Linder, Equation (10-)"
  :precision binary64
  (/ 2.0 (* (* (* (/ (pow t 3.0) (* l l)) (sin k)) (tan k)) (- (+ 1.0 (pow (/ k t) 2.0)) 1.0))))