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

If `veca=2veci+vecj-3veck,vecb=veci-2vecj+veck and vec(c)=-veci+vecj-4veck,& vecd=veci+vecj+veck, then `compute `| (vec(a)xxvec(b))xx(vec(c)xxvec(vec(d)))|`

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The correct Answer is:
`5sqrt(114)`.
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