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?

`vec(A)xxvec(B)=vec(B)xxvec(A)`

`vec(A)xxvec(B)=-ABsintheta`

`vec(A)xxvec(B)=ABcostheta`

`vec(A)xxvec(B)=-vec(B)xxvec(A)`

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