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 r3157851 = 2.0;
double r3157852 = t;
double r3157853 = 3.0;
double r3157854 = pow(r3157852, r3157853);
double r3157855 = l;
double r3157856 = r3157855 * r3157855;
double r3157857 = r3157854 / r3157856;
double r3157858 = k;
double r3157859 = sin(r3157858);
double r3157860 = r3157857 * r3157859;
double r3157861 = tan(r3157858);
double r3157862 = r3157860 * r3157861;
double r3157863 = 1.0;
double r3157864 = r3157858 / r3157852;
double r3157865 = pow(r3157864, r3157851);
double r3157866 = r3157863 + r3157865;
double r3157867 = r3157866 - r3157863;
double r3157868 = r3157862 * r3157867;
double r3157869 = r3157851 / r3157868;
return r3157869;
}
herbie shell --seed 2019132 +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))))