include include

int main() {
double sum = 0;
int count = 0;

for (double x = -2; x <= 2; x += 0.25) {
double y = cos(2 * x);
if (y < 0) {
sum += y;
count++;
}
}
double average = sum / count;
std::cout << "Среднее арифметическое отрицательных значений функции cos(2x) на промежутке [-2; 2] с шагом 0.25: " << average << std::endl;
return 0;

}