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Questions  >>  CBSE XII  >>  Math  >>  Matrices
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If $A = \begin{bmatrix} 1 & \tan x \\ -\tan x & 1 \end{bmatrix} $ , Evaluate $A^TA^{-1}$


$(A)\; \begin{bmatrix} -\cos 2x & \sin 2x \\ \sin 2x & -\cos 2x \end{bmatrix}$
$(B)\; \begin{bmatrix} \cos 2x & -\sin 2x \\ \sin 2x & \cos 2x \end{bmatrix}$
$(C)\; \begin{bmatrix} \cos 2x & -\sin 2x \\ -\sin 2x & \cos 2x \end{bmatrix}$
$(D)\; \begin{bmatrix} -\cos 2x & \sin 2x \\ -\sin 2x & \cos 2x \end{bmatrix}$

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