Question

If $A=\left[\begin{array}{ccc}\alpha&\beta\\ \gamma&-\alpha\end{array}\right]$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

Answer 1

option c is the correct answer