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 r1944534 = 2.0;
double r1944535 = t;
double r1944536 = 3.0;
double r1944537 = pow(r1944535, r1944536);
double r1944538 = l;
double r1944539 = r1944538 * r1944538;
double r1944540 = r1944537 / r1944539;
double r1944541 = k;
double r1944542 = sin(r1944541);
double r1944543 = r1944540 * r1944542;
double r1944544 = tan(r1944541);
double r1944545 = r1944543 * r1944544;
double r1944546 = 1.0;
double r1944547 = r1944541 / r1944535;
double r1944548 = pow(r1944547, r1944534);
double r1944549 = r1944546 + r1944548;
double r1944550 = r1944549 + r1944546;
double r1944551 = r1944545 * r1944550;
double r1944552 = r1944534 / r1944551;
return r1944552;
}
herbie shell --seed 2019149
(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))))