@Test
public void testEcarttrigo() {

    a1 = new Angle(p,p1);
    a2 = new Angle(p,p2);
    a5 = new Angle(p,p5);
    Angle ecart1 = Angle.ecarttrigo(a1, a2);
    System.out.println(ecart1.getValeur());
    assert(Math.abs(ecart1.getValeur() - Math.PI / 4) < 0.01);
    Angle ecart2 = Angle.ecarttrigo(a1, a5);
    System.out.println(ecart2.getValeur());
    assert(Math.abs(ecart2.getValeur() - 3 * Math.PI / 2) < 0.01);
}