If ![A=\left[\begin{array}{ccc}\alpha&\beta\\ \gamma&-\alpha\end{array}\right]](https://tex.z-dn.net/?f=A%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D%5Calpha%26amp%3B%5Cbeta%5C%5C+%5Cgamma%26amp%3B-%5Calpha%5Cend%7Barray%7D%5Cright%5D "A=\left[\begin{array}{ccc}\alpha&\beta\\ \gamma&-\alpha\end{array}\right]")
is such that A² = I, then
(A) 1 + α² + βγ = 0
(B) 1 - α² + βγ = 0
(C) 1 - α² - βγ = 0
(D) 1 + α² - βγ = 0
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option c is the correct answer
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