Define 
and prove that 
where θ is the angle between 
and 
Cross Product: The vector or cross product of two non-zero vectors
and
, denoted by
, is defined as
where θ is the angle between
and 
, 0≤θ≤π and
is a unit vector perpendicular to both
and
, such that
,
and
form a right handed system.
We have
is a unit vector 
But, we have the dot product of two vectors 
and 
forming an angle θ as
Now, we divide these two equations.
Thus,
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