Prove that `(vec(A)+2vec(B)).(2vec(A)-3vec(B))=2A^(2)+AB cos theta-6B^(2)`.

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Prove that `(vec(A)+2vec(B)).(2vec(A)-3vec(B))=2A^(2)+AB cos theta-6B^(2)`.
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Prove that (vec(A)+2vec(B)).(2vec(A)-3vec(B))=2A^(2)+AB 0:02:53

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