Q. 75.0( 1 Vote )
If 
is a unit vector such that 
find 
Answer :
⇒|
|2 - |
|2 = 15
⇒|
|2 = |
|2 + 15
Now , a is a unit vector,
⇒|
| = 1
⇒|
|2 = 12 + 15
⇒|
|2 = 16
⇒|
| = 4
Ans: |
| = 4
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