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 r2142662 = R;
        double r2142663 = 2.0;
        double r2142664 = phi1;
        double r2142665 = phi2;
        double r2142666 = r2142664 - r2142665;
        double r2142667 = r2142666 / r2142663;
        double r2142668 = sin(r2142667);
        double r2142669 = pow(r2142668, r2142663);
        double r2142670 = cos(r2142664);
        double r2142671 = cos(r2142665);
        double r2142672 = r2142670 * r2142671;
        double r2142673 = lambda1;
        double r2142674 = lambda2;
        double r2142675 = r2142673 - r2142674;
        double r2142676 = r2142675 / r2142663;
        double r2142677 = sin(r2142676);
        double r2142678 = r2142672 * r2142677;
        double r2142679 = r2142678 * r2142677;
        double r2142680 = r2142669 + r2142679;
        double r2142681 = sqrt(r2142680);
        double r2142682 = 1.0;
        double r2142683 = r2142682 - r2142680;
        double r2142684 = sqrt(r2142683);
        double r2142685 = atan2(r2142681, r2142684);
        double r2142686 = r2142663 * r2142685;
        double r2142687 = r2142662 * r2142686;
        return r2142687;
}