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- #include <iostream>
- double fan(int n);
- using namespace std;
- double b=-1;
- int a;
- double y(int n)
- {
- if (n==1) {
- return 1./((a-2)+1./a);
- }
- b++;
- return 1/((b * 2 + 1) + y(n - 2));
- }
- int main()
- {
- int n=3;
- a=n;
- double a =y(n);
- cout << a;
- }
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