Teaching UP TGT Mock Test Series 2025 Mathematics Matrices Operations on Matrices

If \(A = \left[ {\begin{array}{*{20}{c}} {\cos \alpha }&{ - \sin \alpha }\\ {\sin \alpha }&{\cos \alpha } \end{array}} \right]\)then \(A + A' = I\), if the value of α is_____

1
π/6
2
π/3
3
π
4
3π/2
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