//用sinx=x-x^3/3!+x^5/5!……+（-1）^(n-1)*(x^(2*n-1)/(2*n-1)!#include#includedouble power(double x,int n){if(n==0)return 1;return x*power(x,n-1);}long f(int n){if(n==0)return 1;elsereturn n*f(n-1);}in...