Cannot sample enough valid points. (more)

\[{\left(\left(x + 1\right) \cdot \left(x - 2\right)\right)}^{\left(-0.5\right)}\]
{\left(\left(x + 1\right) \cdot \left(x - 2\right)\right)}^{\left(-0.5\right)}
double f(double x) {
        double r1905259 = x;
        double r1905260 = 1.0;
        double r1905261 = r1905259 + r1905260;
        double r1905262 = 2.0;
        double r1905263 = r1905259 - r1905262;
        double r1905264 = r1905261 * r1905263;
        double r1905265 = 0.5;
        double r1905266 = -r1905265;
        double r1905267 = pow(r1905264, r1905266);
        return r1905267;
}