20-3

#include <stdio.h>
#include <math.h>

int main()
{
    double a, b, c;
    int n;
    scanf("%lf%lf%d", &a, &b, &n);
    c = (b - a) / n;

    for (double x = a; x <= b; x += c) {
        printf("%lf | ", x);

        if (x <= 2.5) {
            printf("%lf\n", log(1 + fabs(pow(x, 3) + sin(3 * x))));
        } else if (x <= 7.5) {
           printf("%lf\n", (1 + x) * pow(log(5 * x), 2));
        } else {
            printf("%lf\n", pow(cos(3 * pow(x, 3) + 5), log(pow(x, 2) - 20)));
        }

    }

    return 0;
}