Timeout in 10.0m

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\[0.0 \lt c_p \land 0.0 \lt c_n\]
\[\frac{{\left(\frac{1}{1 + e^{-s}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-s}}\right)}^{c_n}}{{\left(\frac{1}{1 + e^{-t}}\right)}^{c_p} \cdot {\left(1 - \frac{1}{1 + e^{-t}}\right)}^{c_n}}\]
\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 r150136 = 1.0;
        double r150137 = s;
        double r150138 = -r150137;
        double r150139 = exp(r150138);
        double r150140 = r150136 + r150139;
        double r150141 = r150136 / r150140;
        double r150142 = c_p;
        double r150143 = pow(r150141, r150142);
        double r150144 = r150136 - r150141;
        double r150145 = c_n;
        double r150146 = pow(r150144, r150145);
        double r150147 = r150143 * r150146;
        double r150148 = t;
        double r150149 = -r150148;
        double r150150 = exp(r150149);
        double r150151 = r150136 + r150150;
        double r150152 = r150136 / r150151;
        double r150153 = pow(r150152, r150142);
        double r150154 = r150136 - r150152;
        double r150155 = pow(r150154, r150145);
        double r150156 = r150153 * r150155;
        double r150157 = r150147 / r150156;
        return r150157;
}

Reproduce

herbie shell --seed 2019195 +o rules:numerics
(FPCore (c_p c_n t s)
  :name "Harley's example"
  :pre (and (< 0.0 c_p) (< 0.0 c_n))

  :herbie-target
  (* (pow (/ (+ 1.0 (exp (- t))) (+ 1.0 (exp (- s)))) c_p) (pow (/ (+ 1.0 (exp t)) (+ 1.0 (exp s))) c_n))

  (/ (* (pow (/ 1.0 (+ 1.0 (exp (- s)))) c_p) (pow (- 1.0 (/ 1.0 (+ 1.0 (exp (- s))))) c_n)) (* (pow (/ 1.0 (+ 1.0 (exp (- t)))) c_p) (pow (- 1.0 (/ 1.0 (+ 1.0 (exp (- t))))) c_n))))