engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Matrices Types of Matrices
If \(A = \left[ {\begin{array}{*{20}{c}} {\sin\alpha }&{ - \cos \alpha }\\ {\cos\alpha }&{\sin \alpha } \end{array}} \right]\), then for what value of α, A is an identity matrix?
1
0°
2
45°
3
90°
4
60°