A = [1, tan x; -tan x, 1]: find A^T A^-1

1. A.
   $\begin{pmatrix}-\cos2x & \sin2x\\ -\sin2x & \cos2x\end{pmatrix}$
2. B.
   $\begin{pmatrix}\cos2x & -\sin2x\\ \sin2x & \cos2x\end{pmatrix}$
3. C.
   $\begin{pmatrix}\cos2x & \sin2x\\ -\sin2x & \cos2x\end{pmatrix}$
4. D.
   $\begin{pmatrix}\cos2x & -\sin2x\\ -\sin2x & \cos2x\end{pmatrix}$

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1. A.
   $\begin{bmatrix} \cos2x & - \sin2x \\ - \sin2x & \cos2x \end{bmatrix}$
2. B.
   $\begin{bmatrix} \cos2x & - \sin2x \\ \sin2x & \cos2x \end{bmatrix}$
3. C.
   $\begin{bmatrix} - \cos2x & \sin2x \\ \sin2x & \cos2x \end{bmatrix}$
4. D.
   $\begin{bmatrix} - \cos2x & \sin2x \\ - \sin2x & \cos2x \end{bmatrix}$

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