JEE PYQ: Matrices And Determinants Question 24
Question 24 - 2021 (25 Feb Shift 2)
If for the matrix, $A = \begin{bmatrix} 1 & -\alpha \ \alpha & \beta \end{bmatrix}$, $AA^T = I_2$, then the value of $\alpha^4 + \beta^4$ is:
(1) $1$
(2) $3$
(3) $2$
(4) $4$