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For vectors vec(A) and vec(B) making an ...

For vectors `vec(A) and vec(B)` making an angle `theta` which one of the following relation is correct?

A

`vec A xx vec B = B xx A

B

`vec A xx vec B = AB sin theta`

C

`vec A xx vec B = AB cos theta`

D

`vec A xx vec B = -B xx A`

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