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Let vec a , vec b ,a n d vec c be non-c...

Let ` vec a , vec b ,a n d vec c` be non-coplanar vectors and let the equation ` vec a^' , vec b^' , vec c '` are reciprocal system of vector ` vec a , vec b , vec c ,` then prove that ` vec axx vec a^'+ vec bxx vec b^'+ vec cxx vec c '` is a null vector.

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