#include <iostream>

#include "trace.h"

using namespace std;

float Saisie_plusgrand(float min) {
    float max;

    do {
        cout << "Saisir";
        cin >> max;
    } while (max <= min);

    return max;
}

float f(float x) {
    float y;
    const float PI = 3.141565358979;

    if (x < 0) {
        y = ((float)3/7) * (cos(x) - 1);
    } else if (x <= 2*PI) {
        y = sin(x) * 2;
    } else {
        y = sin(3*x)/3;
    }

    return y;
}