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 r69083175 = 2.0;
double r69083176 = t;
double r69083177 = 3.0;
double r69083178 = pow(r69083176, r69083177);
double r69083179 = l;
double r69083180 = r69083179 * r69083179;
double r69083181 = r69083178 / r69083180;
double r69083182 = k;
double r69083183 = sin(r69083182);
double r69083184 = r69083181 * r69083183;
double r69083185 = tan(r69083182);
double r69083186 = r69083184 * r69083185;
double r69083187 = 1.0;
double r69083188 = r69083182 / r69083176;
double r69083189 = pow(r69083188, r69083175);
double r69083190 = r69083187 + r69083189;
double r69083191 = r69083190 - r69083187;
double r69083192 = r69083186 * r69083191;
double r69083193 = r69083175 / r69083192;
return r69083193;
}
herbie shell --seed 2019124
(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))))