Use the --timeout flag to change the timeout.
\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)}double f(double t, double l, double k) {
double r61464012 = 2.0;
double r61464013 = t;
double r61464014 = 3.0;
double r61464015 = pow(r61464013, r61464014);
double r61464016 = l;
double r61464017 = r61464016 * r61464016;
double r61464018 = r61464015 / r61464017;
double r61464019 = k;
double r61464020 = sin(r61464019);
double r61464021 = r61464018 * r61464020;
double r61464022 = tan(r61464019);
double r61464023 = r61464021 * r61464022;
double r61464024 = 1.0;
double r61464025 = r61464019 / r61464013;
double r61464026 = pow(r61464025, r61464012);
double r61464027 = r61464024 + r61464026;
double r61464028 = r61464027 - r61464024;
double r61464029 = r61464023 * r61464028;
double r61464030 = r61464012 / r61464029;
return r61464030;
}
herbie shell --seed 2019120 +o rules:numerics
(FPCore (t l k)
:name "Toniolo and Linder, Equation (10-)"
(/ 2 (* (* (* (/ (pow t 3) (* l l)) (sin k)) (tan k)) (- (+ 1 (pow (/ k t) 2)) 1))))