#include <stdio.h>
float sinus(float x) {
float result = x;
float a = x;
int b = 1;
int c = 1;
for (int i = 1; i > 0; i = i + 2) {
a = a * x * x;
b = b * (-1);
c = c * b * (i + 1) * (i + 2);
result = result + a / c;
}
return result;
}
int main() {
printf("%.3f", sinus(45));
return 0;
}