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 r62377915 = 2.0;
double r62377916 = t;
double r62377917 = 3.0;
double r62377918 = pow(r62377916, r62377917);
double r62377919 = l;
double r62377920 = r62377919 * r62377919;
double r62377921 = r62377918 / r62377920;
double r62377922 = k;
double r62377923 = sin(r62377922);
double r62377924 = r62377921 * r62377923;
double r62377925 = tan(r62377922);
double r62377926 = r62377924 * r62377925;
double r62377927 = 1.0;
double r62377928 = r62377922 / r62377916;
double r62377929 = pow(r62377928, r62377915);
double r62377930 = r62377927 + r62377929;
double r62377931 = r62377930 + r62377927;
double r62377932 = r62377926 * r62377931;
double r62377933 = r62377915 / r62377932;
return r62377933;
}
herbie shell --seed 2019107
(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))))