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bar(x) and bar(y) are unit vectors and t...

`bar(x)` and `bar(y)` are unit vectors and the angle between them is `theta`. If `theta` = …………….. Then `bar(x)+bar(y)` is a unit vector.

A

`(pi)/(4)`

B

`(pi)/(2)`

C

`(pi)/(3)`

D

`(2pi)/(3)`

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