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- #include <iostream>
- using namespace std;
- int main()
- {
- long long n,x;
- double S=0,S1=1,S2=1;
- // S la tong ket qua phep tinh, gan gia tri ban dau =0
- // S1 la gia tri de tang mu sau moi vong lap
- // S2 la gia tri tang giai thua sau moi vong lap
- cin>>x; // khai bao bien x
- cin>>n; // khai bao phan tu cuoi cua day
- if (n<=0) return 0; // truong hop n<=0 bi loai
- for (int i=0;i<=(2*n);i++) // tang gia tri i len them 1 lan
- {
- if (i==0) // truong hop i=0
- {
- S1=1;
- S2=1;
- }
- else // truong hop i khac 0
- {
- S1=S1*x*x; // tang gia tri mu
- S2=S2*i*(i-1); // tang giai thua
- }
- S=S+S1/S2;
- i=i+1; // tang gia tri cua bien i len 1 lan
- }
- cout << S; // xuat ket qua
- return 0;
- }
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