copy assignment operator: (2.0, 3.0, 1.0) = (2.0, 3.0, 1.0)
+ operator: (3.0, 1.0, 2.0) + (1.0, 2.0, 4.0) = (4.0, 3.0, 6.0)
length(): (3.0, 1.0, 2.0) = 3.7
dot produkt: (3.0, 1.0, 2.0) dot (1.0, 2.0, 4.0) = 13.0
cross produkt: (3.0, 1.0, 2.0) cross (1.0, 2.0, 4.0) = (-2.0, -10.0, 5.0)