JEE Math Practice Question
If for the matrix, $$A = \left[ {\begin{matrix} 1 & { - \alpha } \\ \alpha & \beta \\ \end{matrix} } \right]$$, $$A{A^T} = {I_2}$$, then the value of $${\alpha ^4} + {\beta ^4}$$ is :
- A.3
- B.2
- C.1
- D.4
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