#include<stdio.h> int main(){ double x,n,l,k,m,sum=0,y,z; double fact(double n); double mypow(double x,double n); double a(double n); scanf("%lf%lf",&x,&n); for(m=1;m<=n;m++){ k=mypow(x,m); l=fact(m); z=a(m); y=z*k/l; sum+=y; } printf("%.4f",sum); } double fact(double n){ double a,b=1; for(a=1;a<=n;a++){ b*=a; } return b; } double mypow(double x,double n){ double m,c=1; for(m=0;m<n;m++){ c*=x; } return c; } double a(double n){ double c,d=1; for(c=1;c<n;c++){ d*=(-1); } return d; }
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