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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 r63388361 = 2.0;
        double r63388362 = t;
        double r63388363 = 3.0;
        double r63388364 = pow(r63388362, r63388363);
        double r63388365 = l;
        double r63388366 = r63388365 * r63388365;
        double r63388367 = r63388364 / r63388366;
        double r63388368 = k;
        double r63388369 = sin(r63388368);
        double r63388370 = r63388367 * r63388369;
        double r63388371 = tan(r63388368);
        double r63388372 = r63388370 * r63388371;
        double r63388373 = 1.0;
        double r63388374 = r63388368 / r63388362;
        double r63388375 = pow(r63388374, r63388361);
        double r63388376 = r63388373 + r63388375;
        double r63388377 = r63388376 - r63388373;
        double r63388378 = r63388372 * r63388377;
        double r63388379 = r63388361 / r63388378;
        return r63388379;
}

Reproduce

herbie shell --seed 2019124 +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))))