12. Fill in the blanks. The missing word is might, must or cannot. be parallel. te) Two planes perpendicular to a third plane ) Two lines perpendicular to a plane be parallel. be parallel. (c) Two lines in R' perpendicular to a third line be zer (d) If the columns of a square matrix span R', then the determinant of A (e) If A and B are two invertible matrices then Col A MUST be equal to Row B. be orthogonal to u. (f) If u and v are any two vectors in R°, then u × V

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