Cannot sample enough valid points. (more)

\[x \cdot \sqrt{y \cdot y - z \cdot z}\]
x \cdot \sqrt{y \cdot y - z \cdot z}
double f(double x, double y, double z) {
        double r813875 = x;
        double r813876 = y;
        double r813877 = r813876 * r813876;
        double r813878 = z;
        double r813879 = r813878 * r813878;
        double r813880 = r813877 - r813879;
        double r813881 = sqrt(r813880);
        double r813882 = r813875 * r813881;
        return r813882;
}