Cannot sample enough valid points. (more)

\[\tan^{-1}_* \frac{\sin \left(\lambda_1 - \lambda_2\right) \cdot \cos \phi_2}{\cos \phi_1 \cdot \sin \phi_2 - \left(\sin \phi_1 \cdot \cos \phi_2\right) \cdot \cos \left(\lambda_1 - \lambda_2\right)}\]
\tan^{-1}_* \frac{\sin \left(\lambda_1 - \lambda_2\right) \cdot \cos \phi_2}{\cos \phi_1 \cdot \sin \phi_2 - \left(\sin \phi_1 \cdot \cos \phi_2\right) \cdot \cos \left(\lambda_1 - \lambda_2\right)}
double f(double lambda1, double lambda2, double phi1, double phi2) {
        double r1686049 = lambda1;
        double r1686050 = lambda2;
        double r1686051 = r1686049 - r1686050;
        double r1686052 = sin(r1686051);
        double r1686053 = phi2;
        double r1686054 = cos(r1686053);
        double r1686055 = r1686052 * r1686054;
        double r1686056 = phi1;
        double r1686057 = cos(r1686056);
        double r1686058 = sin(r1686053);
        double r1686059 = r1686057 * r1686058;
        double r1686060 = sin(r1686056);
        double r1686061 = r1686060 * r1686054;
        double r1686062 = cos(r1686051);
        double r1686063 = r1686061 * r1686062;
        double r1686064 = r1686059 - r1686063;
        double r1686065 = atan2(r1686055, r1686064);
        return r1686065;
}