#include <iostream>
#include <cmath>
int main() {
double x,y,z,a,b,c,r,k ;
x=-15.246;
y=4.642e-2;
z=20.001e2;
k=fabs(x);
a=log(pow(1/y,sqrt(k))*(k-y/2));
b=pow(sin(atan(z)),2);
r=a+b;
std::cout << r << std::endl;
return 0;
}
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