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0071. Sikl11
Time limit : 1000 ms
Memory limit : 64 mb
Berilgan ketma-ketlikni dastlabki $n$ ta xadi yig’indisini toping
$$S = 1 - \frac{x^2}{2!} + \frac{x^4}{4!} - \frac{x^6}{6!} + ... + \frac{(-1)^{n-1} x^{2n - 2}}{(2n -2)!}$$
Kiruvchi ma’lumotlar:
ikkita butun son $n$ va $x$ $(0 < n,x \le 9)$;
Chiquvchi ma’lumotlar:
$S$ – ketma-ketlikni dastlabki $n$ ta xadi yig’indisi $10^{-3}$ aniqlikda chiqarilsin.
Input |
---|
1 1 |
Output |
1.000 |
Input |
---|
2 2 |
Output |
-1.000 |