If \(A=\left(\begin{array}{ll}\frac{1}{\sqrt{5}} & \frac{2}{\sqrt{5}} \\ \frac{-2}{\sqrt{5}} & \frac{1}{\sqrt{5}…

If \(A=\left(\begin{array}{ll}\frac{1}{\sqrt{5}} & \frac{2}{\sqrt{5}} \\ \frac{-2}{\sqrt{5}} & \frac{1}{\sqrt{5}}\end{array}\right), B=\left(\begin{array}{ll}1 & 0 \\ i & 1\end{array}\right), i =\sqrt{-1}\), and \(Q=A^T B A\), then the inverse of the matrix \(A Q^{2021} A^T\) is equal to

[JEE Main 2021, 26 Aug (Shift 1)]