If then ATA 1 ........

If $\begin{bmatrix} 1 & \tan x \\ -\tan & 1\\ \end{bmatrix}$ , then A^TA^-1 =

$\begin{bmatrix} -\cos2x & \sin 2x \\ & & \\-sin2x & cos2x\\ \end{bmatrix}$

$\begin{bmatrix} \cos2x &- \sin 2x \\ & & \\sin2x & cos2x\\ \end{bmatrix}$

$\begin{bmatrix} -\cos2x & \cos2x \\ & & \\cos2x & sin2x\\ \end{bmatrix}$

None of these

$\begin{bmatrix} \cos2x &- \sin 2x \\ & & \\sin2x & cos2x\\ \end{bmatrix}$

Submit Error