Cannot sample enough valid points. (more)

\[R \cdot \left(2 \cdot \tan^{-1}_* \frac{\sqrt{{\left(\sin \left(\frac{\phi_1 - \phi_2}{2}\right)\right)}^{2} + \left(\left(\cos \phi_1 \cdot \cos \phi_2\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)}}{\sqrt{1 - \left({\left(\sin \left(\frac{\phi_1 - \phi_2}{2}\right)\right)}^{2} + \left(\left(\cos \phi_1 \cdot \cos \phi_2\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)\right)}}\right)\]
R \cdot \left(2 \cdot \tan^{-1}_* \frac{\sqrt{{\left(\sin \left(\frac{\phi_1 - \phi_2}{2}\right)\right)}^{2} + \left(\left(\cos \phi_1 \cdot \cos \phi_2\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)}}{\sqrt{1 - \left({\left(\sin \left(\frac{\phi_1 - \phi_2}{2}\right)\right)}^{2} + \left(\left(\cos \phi_1 \cdot \cos \phi_2\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)\right) \cdot \sin \left(\frac{\lambda_1 - \lambda_2}{2}\right)\right)}}\right)
double f(double R, double lambda1, double lambda2, double phi1, double phi2) {
        double r2199788 = R;
        double r2199789 = 2.0;
        double r2199790 = phi1;
        double r2199791 = phi2;
        double r2199792 = r2199790 - r2199791;
        double r2199793 = r2199792 / r2199789;
        double r2199794 = sin(r2199793);
        double r2199795 = pow(r2199794, r2199789);
        double r2199796 = cos(r2199790);
        double r2199797 = cos(r2199791);
        double r2199798 = r2199796 * r2199797;
        double r2199799 = lambda1;
        double r2199800 = lambda2;
        double r2199801 = r2199799 - r2199800;
        double r2199802 = r2199801 / r2199789;
        double r2199803 = sin(r2199802);
        double r2199804 = r2199798 * r2199803;
        double r2199805 = r2199804 * r2199803;
        double r2199806 = r2199795 + r2199805;
        double r2199807 = sqrt(r2199806);
        double r2199808 = 1.0;
        double r2199809 = r2199808 - r2199806;
        double r2199810 = sqrt(r2199809);
        double r2199811 = atan2(r2199807, r2199810);
        double r2199812 = r2199789 * r2199811;
        double r2199813 = r2199788 * r2199812;
        return r2199813;
}