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If ( vec axx vec b)xx( vec bxx vec c)= v...

If `( vec axx vec b)xx( vec bxx vec c)= vec b ,w h e r e vec a , vec b ,a n d vec c` are nonzero vectors, then ` vec a , vec b ,a n d vec c` can be coplanar ` vec a , vec b ,a n d vec c` must be coplanar ` vec a , vec b ,a n d vec c` cannot be coplanar none of these

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