If \[A=\left[ \begin{matrix} \alpha & \beta \\ \gamma & \delta \\ \end{matrix} \right]\] such that \[{{A}^{2}}\] is a two - rowed unit matrix, then \[\delta \] is equal to

If \[A=\left[ \begin{matrix} \alpha & \beta \\ \gamma�

1.	If \[A=\left[ \begin{matrix} \alpha & \beta \\ \gamma & \delta \\ \end{matrix} \right]\] such that \[{{A}^{2}}\] is a two - rowed unit matrix, then \[\delta \] is equal to
A.	\[\alpha \]
B.	\[\beta \]
C.	\[\gamma \]
D.	None of these
Answer» B. \[\beta \]

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If \[A=\left[ \begin{matrix} \alpha & \beta \\ \gamma & \delta \\ \end{matrix} \right]\] such that \[{{A}^{2}}\] is a two - rowed unit matrix, then \[\delta \] is equal to

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