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If hat A and hat B are unit vectors and ...

If `hat A` and `hat B` are unit vectors and `theta` is angle between them then choose the correct option

A

`|hatA - hatB | = | hatA + hatB | tan (theta/2)`

B

`| hatA - hatB | = | hatA - hatB | tan (theta/2)`

C

`| hatA - hatB | = |hatA + hatB | cos(theta/2)`

D

`| hatA - hatB | = |hatA + hatB | cos (theta/2)`

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