Normalizing a vector: normalize unitV

The normalize command finds the unit vector in the direction of a given vector.
unitV is a synonym for normalize.

normalize takes one argument:
V, a vector (list).
normalize(V) normalizes this vector for the l² norm (the square root of the sum of the squares of its coordinates).

Example.
Input:

normalize([3,4,5])

Output:

⎡
⎢
⎢
⎢
⎢
⎣

√

⎤
⎥
⎥
⎥
⎥
⎦