For text A = left begin array 20 c 1& tan...

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For \[{\text{A}} = \left[ {\begin{array}{*{20}{c}} 1&{\tan \,{\text{x}}} \\ { - \tan {\text{ x}}}&1 \end{array}} \right],\] the determinant of A^TA^-1 is

A. sec²x

B. cos4x

C. 1

D. 0

Answer: Option C

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