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The angle between two vectors vec(A) and...

The angle between two vectors `vec(A)` and `vec(B)` is `theta`. Then the magnitude of the product `vec(A).(vec(B) xx vec(A))` is :

A

`BA^(2) cos theta`

B

`BA^(2) sin theta`

C

`BA^(2) sin theta cos theta`

D

zero

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The correct Answer is:
D
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