What does vector multiplication equal to 1 mean?

Let two parallel vectors be vector a and vector B
Vector a · vector b = |a ·|b · (angle between vectors a and b),
Because the directions of the two vectors are opposite and parallel, the angle between them is
Then cos 180 ° = - 1
So, vector a · vector b = - |a ·|b |
So the product of two parallel and opposite vectors is vector a · vector b = - |a ·|b |
The answer was fast just now,

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