Dot Product of two vectors.
Returns lhs . rhs.
For normalized vectors Dot returns 1 if they point in exactly the same direction;
-1 if they point in completely opposite directions; and a number in between for other
cases (e.g. Dot returns zero if vectors are perpendicular).
For vectors of arbitrary length the Dot return values are similar: they get larger when the angle between vectors
decreases.
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