Timeout in 10.0m

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\[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]
\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)
double f(double a, double b) {
        double r42290077 = atan2(1.0, 0.0);
        double r42290078 = 2.0;
        double r42290079 = r42290077 / r42290078;
        double r42290080 = 1.0;
        double r42290081 = b;
        double r42290082 = r42290081 * r42290081;
        double r42290083 = a;
        double r42290084 = r42290083 * r42290083;
        double r42290085 = r42290082 - r42290084;
        double r42290086 = r42290080 / r42290085;
        double r42290087 = r42290079 * r42290086;
        double r42290088 = r42290080 / r42290083;
        double r42290089 = r42290080 / r42290081;
        double r42290090 = r42290088 - r42290089;
        double r42290091 = r42290087 * r42290090;
        return r42290091;
}

Reproduce

herbie shell --seed 2019124 
(FPCore (a b)
  :name "NMSE Section 6.1 mentioned, B"
  (* (* (/ PI 2) (/ 1 (- (* b b) (* a a)))) (- (/ 1 a) (/ 1 b))))