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  1. #include <iostream>
  2. #include <cmath>
  3. #define PI 3.1415926
  4. using namespace std;
  5.  
  6. double f(double e, double x){
  7. 	int i = 0;
  8. 	double p = x;
  9. 	double s = x;
  10. 	while (p > e){
  11. 		p*=(x*x*(2*i + 1)*(2*i + 1))/(2*(i+1)*(2*i + 3));
  12. 		s+=p;
  13. 		i++;
  14. 	}
  15. 	return s;
  16. }
  17.  
  18. int main() {
  19. 	double e; //точность
  20. 	double x;
  21. 	cin >> e >> x;
  22. 	cout << PI/2 - f(e, x) << endl;
  23. 	cout << acos(x);
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 3460KB
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0.00001 0.99
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https://ideone.com/WC5MkW
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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