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 r2792018 = R;
        double r2792019 = 2.0;
        double r2792020 = phi1;
        double r2792021 = phi2;
        double r2792022 = r2792020 - r2792021;
        double r2792023 = r2792022 / r2792019;
        double r2792024 = sin(r2792023);
        double r2792025 = pow(r2792024, r2792019);
        double r2792026 = cos(r2792020);
        double r2792027 = cos(r2792021);
        double r2792028 = r2792026 * r2792027;
        double r2792029 = lambda1;
        double r2792030 = lambda2;
        double r2792031 = r2792029 - r2792030;
        double r2792032 = r2792031 / r2792019;
        double r2792033 = sin(r2792032);
        double r2792034 = r2792028 * r2792033;
        double r2792035 = r2792034 * r2792033;
        double r2792036 = r2792025 + r2792035;
        double r2792037 = sqrt(r2792036);
        double r2792038 = 1.0;
        double r2792039 = r2792038 - r2792036;
        double r2792040 = sqrt(r2792039);
        double r2792041 = atan2(r2792037, r2792040);
        double r2792042 = r2792019 * r2792041;
        double r2792043 = r2792018 * r2792042;
        return r2792043;
}