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if veca=veci-2vecj+veck, vecb=2veci+vecj...

if `veca=veci-2vecj+veck, vecb=2veci+vecj+veck, vec(c)=veci+2vecj-veck`, then find `vecaxx (vecbxxvecc) and |vecaxx(vecbxxvecc)|`.

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The correct Answer is:
`sqrt(174)`.
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