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Let overset(to)(a) and overset(to)(b) be...

Let `overset(to)(a) and overset(to)(b)` be two unit vectors and `theta` is the angle between them. The `overset(to)(a) + overset(to)(b)` is a unit vector if :

A

`theta = (pi)/(4)`

B

`theta = (pi)/(3)`

C

`theta = (pi)/(2)`

D

`theta = (2pi)/(3)`

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