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|AxB| = |A|*|B|*sin #
Where # is the angle between the two vectors.
Hence, sin # = |AxB| / (|A|*|B|) = 8/10
Hence, cos # = √(1-(8/10)²) = 6/10 or 3/5
|A|.|B| = |A|*|B|*cos # = 2*5*(3/5) = 6
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