Distance

Write a function dist3(x1,y1,x2,y2) that takes the cartesian coordinates of two points on the plane (x1,y1) i (x2,y2) and returns the distance in norm 3 between the two points. This distance is defined as: \(\sqrt[3] { \left| x1-x2 \right| ^3 + \left|y1-y2 \right| ^3 }\)