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If vec a , vec b , vec c are any three ...

If ` vec a , vec b , vec c` are any three noncoplanar vector, then the equaltion `[ vec bxx vec c vec cxx vec a vec axx vec b]x^2+[ vec a+ vec b vec b+ vec c vec c+ vec a]x+1+[ vec b- vec c vec c- vec a vec a- vec b]=0` has roots a. real and distinct b. real c. equal d. imaginary

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