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#include
int main() { int x,i; double fact=1,pro,sum=0; scanf("%d",&x); for(i=1;i<=100;i+=2) { pro=pow(x,i); if(i>1) { fact*=(i*(i-1)); } if((i-1)%4==0) sum+=(pro/fact); else sum-=(pro/fact); } printf("%.3lf",sum); return 0; }
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