If veca=3hati-hatj+2hatk, vecb=2hati+hat...

If `veca=3hati-hatj+2hatk, vecb=2hati+hatj-hatk, vecc=hati-2hatj+2hatk`, find `(vecaxxvecb)xxvecc and vecaxx(vecbxxvecc)` and hence show that `(vecaxxvecb)xxvecc!=veca(vecbxxvecc)`

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