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[" 16.Prove that : "],[qquad (vec A+2vec...

[" 16.Prove that : "],[qquad (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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