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If theta is the angle between the unit v...

If `theta` is the angle between the unit vectors `hat a` and `hat b` then `cos (theta/2)` is equal to

A

`(1)/(2)|a-b|`

B

`(1)/(2)|a+b|`

C

`(|a-b|)/(|a+b|)`

D

`(|a+b|)/(|a-b|)`

Text Solution

Verified by Experts

The correct Answer is:
B
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