For A = $\begin{bmatrix} \ 1 & tan x \ \ - tan x & 1 \ \end{bmatrix}$, the determinant of AT A-1 is
Reveal answer
Fill a bubble to check yourself
For A = $\begin{bmatrix} \ 1 & tan x \ \ - tan x & 1 \ \end{bmatrix}$, the determinant of AT A-1 is