Use the --timeout flag to change the timeout.
{\left(x + 1\right)}^{\left(\frac{1}{n}\right)} - {x}^{\left(\frac{1}{n}\right)}
(FPCore (x n) :precision binary64 (- (pow (+ x 1.0) (/ 1.0 n)) (pow x (/ 1.0 n))))
double code(double x, double n) {
return pow((x + 1.0), (1.0 / n)) - pow(x, (1.0 / n));
}