Find an angle between two vectors 
and 
with magnitudes 1 and 2 respectively and 
.
We are given that 
and 
.
And
,
So we have,
|
| =
⇒ 
⇒ 
⇒ 
1
Find an angle between two vectors and with magnitudes 1 and 2 respectively and .
We are given that and .
And,
So we have,
|| =
⇒
⇒
⇒