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Let vec a , vec b , vec c are three non...

Let ` vec a , vec b , vec c` are three non-zero vectors such that ` vec axx vec b= vec ca n d vec bxx vec c= vec a ;` prove that ` vec a , vec b , vec c` are mutually at righ angles such that `| vec b|=1a n d| vec c|=| vec a|dot`

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