Timeout in 10.0m

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\[0 \lt c_p \land 0 \lt c_n\]
\[\frac{{\left(\frac{1}{1 + e^{-s}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-s}}\right)}^{c_n}}{{\left(\frac{1}{1 + e^{-t}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-t}}\right)}^{c_n}}\]
\frac{{\left(\frac{1}{1 + e^{-s}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-s}}\right)}^{c_n}}{{\left(\frac{1}{1 + e^{-t}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-t}}\right)}^{c_n}}
double f(double c_p, double c_n, double t, double s) {
        double r9059990 = 1.0;
        double r9059991 = s;
        double r9059992 = -r9059991;
        double r9059993 = exp(r9059992);
        double r9059994 = r9059990 + r9059993;
        double r9059995 = r9059990 / r9059994;
        double r9059996 = c_p;
        double r9059997 = pow(r9059995, r9059996);
        double r9059998 = r9059990 - r9059995;
        double r9059999 = c_n;
        double r9060000 = pow(r9059998, r9059999);
        double r9060001 = r9059997 * r9060000;
        double r9060002 = t;
        double r9060003 = -r9060002;
        double r9060004 = exp(r9060003);
        double r9060005 = r9059990 + r9060004;
        double r9060006 = r9059990 / r9060005;
        double r9060007 = pow(r9060006, r9059996);
        double r9060008 = r9059990 - r9060006;
        double r9060009 = pow(r9060008, r9059999);
        double r9060010 = r9060007 * r9060009;
        double r9060011 = r9060001 / r9060010;
        return r9060011;
}

Reproduce

herbie shell --seed 2019163 +o rules:numerics
(FPCore (c_p c_n t s)
  :name "Harley's example"
  :pre (and (< 0 c_p) (< 0 c_n))

  :herbie-target
  (* (pow (/ (+ 1 (exp (- t))) (+ 1 (exp (- s)))) c_p) (pow (/ (+ 1 (exp t)) (+ 1 (exp s))) c_n))

  (/ (* (pow (/ 1 (+ 1 (exp (- s)))) c_p) (pow (- 1 (/ 1 (+ 1 (exp (- s))))) c_n)) (* (pow (/ 1 (+ 1 (exp (- t)))) c_p) (pow (- 1 (/ 1 (+ 1 (exp (- t))))) c_n))))