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If veca=veci-2vecj-3veck,vecb=2veci+vecj...

If `veca=veci-2vecj-3veck,vecb=2veci+vecj-veck and vec(c)=veci+3vecj-2veck`, verify that `vecaxx(vecbxxvec(c))ne(vecaxxvecb)xxvec(c)`.

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The correct Answer is:
`vecaxx(vecaxxvecb)ne(vecaxxvecb)xxvecc`
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