65 - ZOJ Monthly, May 2008 - 1002
F0(x) = sin(x) / x
There are multiple test cases. Each test case consists of one line containing two numbers. The first number specifies n, a non-negative integer not more than 20. The second number specifies x, a positive real number between 0.10 and 20.00.
For each test case, output Fn(x), using scientific expression with four valid digits as the sample output. It is guaranteed that the exponentials of the answers are all negative.
3 10.0 5 1.00 8 0.10
-3.950*10^-2 9.256*10^-5 2.901*10^-16
Author: HE, Rongqiang