in Linear Algebra retagged by
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For $A = \begin{bmatrix} 1 &\tan x \\ -\tan x &1 \end{bmatrix},$ the determinant of $A^{T}A^{-1}$ is

  1. $\sec^{2}x$
  2. $\cos 4x$
  3. $1$
  4. $0$
in Linear Algebra retagged by
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