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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-(vecb*vec c)veca`

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