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Let veca and vecb be two unit vectors an...

Let `veca` and `vecb` be two unit vectors and `theta` is the angle between them. Then `veca+vecb` is a unit vector if :

A

`theta= pi/4`

B

`theta = pi/3`

C

`theta = pi/2`

D

`theta = (2pi)/3`

Text Solution

Verified by Experts

The correct Answer is:
D
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