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Sticky Note
A^T= A^-1, where A is a real matrix, then A is?
  1. Normal
  2. Orthogonal
  3. Symmetric
  4. None of these
Explanation
  • A matrix AA is orthogonal if AT=A−1A^T = A^{-1}, meaning its transpose is equal to its inverse.
  • This property ensures that the matrix preserves length and angles under transformation.

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