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 r4073672 = R;
        double r4073673 = 2.0;
        double r4073674 = phi1;
        double r4073675 = phi2;
        double r4073676 = r4073674 - r4073675;
        double r4073677 = r4073676 / r4073673;
        double r4073678 = sin(r4073677);
        double r4073679 = pow(r4073678, r4073673);
        double r4073680 = cos(r4073674);
        double r4073681 = cos(r4073675);
        double r4073682 = r4073680 * r4073681;
        double r4073683 = lambda1;
        double r4073684 = lambda2;
        double r4073685 = r4073683 - r4073684;
        double r4073686 = r4073685 / r4073673;
        double r4073687 = sin(r4073686);
        double r4073688 = r4073682 * r4073687;
        double r4073689 = r4073688 * r4073687;
        double r4073690 = r4073679 + r4073689;
        double r4073691 = sqrt(r4073690);
        double r4073692 = 1.0;
        double r4073693 = r4073692 - r4073690;
        double r4073694 = sqrt(r4073693);
        double r4073695 = atan2(r4073691, r4073694);
        double r4073696 = r4073673 * r4073695;
        double r4073697 = r4073672 * r4073696;
        return r4073697;
}