Timeout in 10.0m

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\[R \cdot \sqrt{\left(\left(\lambda_1 - \lambda_2\right) \cdot \cos \left(\frac{\phi_1 + \phi_2}{2}\right)\right) \cdot \left(\left(\lambda_1 - \lambda_2\right) \cdot \cos \left(\frac{\phi_1 + \phi_2}{2}\right)\right) + \left(\phi_1 - \phi_2\right) \cdot \left(\phi_1 - \phi_2\right)}\]
R \cdot \sqrt{\left(\left(\lambda_1 - \lambda_2\right) \cdot \cos \left(\frac{\phi_1 + \phi_2}{2}\right)\right) \cdot \left(\left(\lambda_1 - \lambda_2\right) \cdot \cos \left(\frac{\phi_1 + \phi_2}{2}\right)\right) + \left(\phi_1 - \phi_2\right) \cdot \left(\phi_1 - \phi_2\right)}
double f(double R, double lambda1, double lambda2, double phi1, double phi2) {
        double r126510600 = R;
        double r126510601 = lambda1;
        double r126510602 = lambda2;
        double r126510603 = r126510601 - r126510602;
        double r126510604 = phi1;
        double r126510605 = phi2;
        double r126510606 = r126510604 + r126510605;
        double r126510607 = 2.0;
        double r126510608 = r126510606 / r126510607;
        double r126510609 = cos(r126510608);
        double r126510610 = r126510603 * r126510609;
        double r126510611 = r126510610 * r126510610;
        double r126510612 = r126510604 - r126510605;
        double r126510613 = r126510612 * r126510612;
        double r126510614 = r126510611 + r126510613;
        double r126510615 = sqrt(r126510614);
        double r126510616 = r126510600 * r126510615;
        return r126510616;
}

Reproduce

herbie shell --seed 2019125 
(FPCore (R lambda1 lambda2 phi1 phi2)
  :name "Equirectangular approximation to distance on a great circle"
  (* R (sqrt (+ (* (* (- lambda1 lambda2) (cos (/ (+ phi1 phi2) 2))) (* (- lambda1 lambda2) (cos (/ (+ phi1 phi2) 2)))) (* (- phi1 phi2) (- phi1 phi2))))))