942-22 guruh, Musobaqa#1
Problem Tasks
| # | Date | State |
|---|
Not Contest
| # | Date | State |
|---|
C. Yakuniy_3_E
Time limit : 1000 ms
Memory limit : 64 mb
Yig’indini xisoblang
$$S = cos(x) - \frac{1}{2}cos(2x)+\frac{1}{3}cos(3x)+...+(-1)^{n-1}\frac{1}{n}cos(nx)$$
Kiruvchi ma’lumotlar: Bitta satrda $n$ butun va $x$ haqiqiy sonlar berilgan $(1 \le x,n \le 50)$.
Chiquvchi ma’lumotlar: Bitta son masala yechimi. Yechim $10^{-2}$ aniqlikda chiqarilsin
| Input |
|---|
| 3 3.4 |
| Output |
| -1.64 |
| Input |
|---|
| 7 5.46 |
| Output |
| 0.68 |