The angle between two vectors 
and 
with magnitudes 
and 4, respectively, and 
is
Given that, 
Let θ be the angle between vector a and b.
Then, 
⇒ 
⇒ 
⇒ 
22
The angle between two vectors and with magnitudes and 4, respectively, and is
Given that,
Let θ be the angle between vector a and b.
Then,
⇒
⇒
⇒