3. [30\%] A unit vector is a vector whose magnitude is 1 . Unit vectors are used in many areas of engineering and physics. A unit vector can be calculated from any vector by dividing the vector by the magnitude of the vector. A three-dimensional unit vector in the direction of vector v=x+ y+zk can be calculated as u=x2+y2+z2x+y+zk Write a script file that accepts a three-dimensional vector in rectangular coordinates and calculates the unit vector