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If vecP.vecQ=PQ then angle between vecP ...

If `vecP.vecQ=PQ` then angle between `vecP` and `vecQ` is

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The correct Answer is:
A
`vec(A)xxvec(B)=vec(B)xxvec(A)`
This is only possible if the value of both vectors `vec(A)xxvec(B)` and `vec(B)xxvec(A)` is zero. This occurs when the angle between `vec(A)` and `vec(B)` is `pi`.
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