VectorHard
Question
Let 
and 
be two unit vectors such that | 
+ 
| = √3. If 
= 
+ 2
+ (
× 
), than2 |
| is equal to :
and be two unit vectors such that | + | = √3. If = + 2 + ( × ), than2 || is equal to :Options
A.
B.
C.
D.
Solution
= √3⇒
= 3⇒ 1 + 1 + 2.1.1 cos θ = 3
⇒ cos θ =
⇒ θ =
......(1)∵
⇒
= 1 - 
⇒
= 
= 1 + 4 + 4
= 7 +
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