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If vec(a) and vec(b) are the unit vector...

If `vec(a) and vec(b)` are the unit vectors and `theta` is the angle between them, then `vec(a) + vec(b)` is a unit vector if

A

`a= (pi)/(4)`

B

`theta= (pi)/(6)`

C

`theta= (pi)/(2)`

D

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

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