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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