#include <iostream>
#include <math.h>
using namespace std;
int main(){
float a=3.14, b=-1.57, c=10.5;
short d=8;
cout << 0.5 * log((1+sin(b)) / (1 - sin(a)) * (c - d));
return 0;
}
#include <iostream>
#include <math.h>
using namespace std;
int main(){
float a=3.14, b=-1.57, c=10.5;
short d=8;
cout << 0.5 * log((1+sin(b)) / (1 - sin(a)) * (c - d));
return 0;
}