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For non-zero vectors vec a , vec b ,a n...

For non-zero vectors ` vec a , vec b ,a n d vec c ,|( vec axx vec b)dot vec c|=| vec a|| vec b|| vec c|` holds if and only if a.` vec a* vec b=0, vec b* vec c=0` b. ` vec b* vec c=0, vec c* vec a=0` c. ` vec c* vec a=0, vec a* vec b=0` d. ` vec a* vec b=0, vec b* vec c=0, vec c* vec a=0`

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