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If veca and vecb are unit vectors and th...

If `veca and vecb` are unit vectors and `theta` is the angle between `veca and vecb`, then `sin.(theta)/(2)` is

A

`|veca-vecb|`

B

`|veca+vecb|`

C

`(|veca+vecb|)/(2)`

D

`(|veca-vecb|)/(2)`

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