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vec(a)=hati-2hatj+hatk,vec(b)=2hati+hatj...

`vec(a)=hati-2hatj+hatk,vec(b)=2hati+hatj+hatk`,
`vec( c )=hati+2hatj-hatk` then find that
`vec(a)xx(vec(b)xxvec( c ))`.

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