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\[\frac{2}{\left(\left(\frac{{t}^{3}}{\ell \cdot \ell} \cdot \sin k\right) \cdot \tan k\right) \cdot \left(\left(1 + {\left(\frac{k}{t}\right)}^{2}\right) + 1\right)}\]
\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 r1659697 = 2.0;
        double r1659698 = t;
        double r1659699 = 3.0;
        double r1659700 = pow(r1659698, r1659699);
        double r1659701 = l;
        double r1659702 = r1659701 * r1659701;
        double r1659703 = r1659700 / r1659702;
        double r1659704 = k;
        double r1659705 = sin(r1659704);
        double r1659706 = r1659703 * r1659705;
        double r1659707 = tan(r1659704);
        double r1659708 = r1659706 * r1659707;
        double r1659709 = 1.0;
        double r1659710 = r1659704 / r1659698;
        double r1659711 = pow(r1659710, r1659697);
        double r1659712 = r1659709 + r1659711;
        double r1659713 = r1659712 + r1659709;
        double r1659714 = r1659708 * r1659713;
        double r1659715 = r1659697 / r1659714;
        return r1659715;
}

Reproduce

herbie shell --seed 2019179 
(FPCore (t l k)
  :name "Toniolo and Linder, Equation (10+)"
  (/ 2.0 (* (* (* (/ (pow t 3.0) (* l l)) (sin k)) (tan k)) (+ (+ 1.0 (pow (/ k t) 2.0)) 1.0))))