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If vec a and vec b are orthogonal uni...

If ` vec a` and `vec b` are orthogonal unit vectors, then for a vector ` vec r` noncoplanar with ` vec a` and `vec b` , vector `rxxa` is equal to a. `[ vec r vec a vec b] vec b-( vec r. vec b)( vec bxx vec a)` b. `[ vec r vec a vec b]( vec a+ vec b)` c. `[ vec r vec a vec b] vec a-( vec r. vec a) vec axx vec b` d. none of these

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