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Q7 of 181 Page 1073

If is a unit vector such that find

⇒||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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