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If veca=2hati+3hatj-hatk, vecb=3hati+5ha...

If `veca=2hati+3hatj-hatk, vecb=3hati+5hatj+2hatk, vec c= -hati-2hatj+3hatk`, verify that `veca xx (vecb xx vec c)=(veca*vec c)vecb-(veca*vecb)vec c`

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