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+#include <iostream>
+
+int main() {
+ const double PI = 3.14159;
+
+ double alpha, beta;
+ std::cin >> alpha >> beta;
+
+ double x = alpha + beta;
+ double sinx = (16.0 * x * (PI - x)) / (5 * PI * PI - 4 * x * (PI - x));
+ x += PI / 2;
+ double cosx = (16.0 * x * (PI - x)) / (5 * PI * PI - 4 * x * (PI - x));
+ std::cout << (sinx / cosx);
+
+ return 0;
+}