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What is the determinant of any orthogonal matrix?

  • A.always exactly one
  • B.always exactly zero
  • C.equal to the trace of the matrix
  • D.plus or minus one

Answer: D

Taking determinants of the defining relation gives the square of the determinant equal to one, so the value is plus or minus one. The positive case is a pure rotation and the negative case a rotation combined with a reflection.

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